To think a bit of understanding isn’t too much to ask?

I would reply to her that you're disappointed in her as a friend as you're going through a stressful time, genuinely forgot and she's not being understanding.

This is not a friend Op, you need to cut ties with her.

Honestly OP, I wouldn't give Housezilla another thought.

She clearly hasn't given you any.

Do you want to stay friends with someone so self absorbed that only her problems deserve airtime and compassion in this world?

It sounds to me like continuing this friendship is just going to tax you of your time and energy in the long run and she isn't going to help refill your cup unless it's convenient to her.

Just think about when you have this baby, your life will be utterly unpredictable and you will rightly be in your own little bubble, recovering, enjoying new life, feeling all of the ups and downs, possibly even grieving expectations you previously had. Where will she be? Will she be a shoulder to cry on a someone to lean on? It doesn't sound like it to me.

You've got the perfect opportunity to grab control here and tell her you've no interest in resuming contact with someone who lacks compassion and end it there if you choose to, but if you do give her another chance please be prepared to enforce your own boundaries for what behaviour and expectations you have of her as friend, and be firm about them.

Wow she's got some serious main character syndrome

YANBU at all. You made a mistake and you apologised - any normal person with any kind of basic kindness and empathy would understand entirely. She’s being a dick, frankly.

That’s not a friend if her need to show off her new house has overwhelmed her need to support a pregnant friend whose partner has buggered off and who has just survived one of the most sentimental times of the year with an entirely new future stretching in front of you than the one you thought was going to happen.
It’s not like the house is going anywhere, it’ll probably still be available for viewing in a few months.
if she doesn’t suddenly realise she’s being an arse and apologise profusely for being so, then cool the relationship. It won’t get any easier once you’ve had a lovely baby that doesn’t keep to her schedule.

These things happen, just put it behind you and move on. If she won’t accept your apology then she’s a minge and you’re better off rid.

It's annoying when someone doesn't show up for a planned event because they forgot, and it doesn't make you feel very important or special to that person. That said, knowing everything you're currently dealing with, she should have been more understanding and less emotional in her response. The only possible partial 'excuse', imo, would be if you're constantly forgetting engagements with her and this was the last straw that made her lose her cool. It doesn't sound like that's what has happened here, though, so she should have just accepted that, no, her new house is not actually the most important thing on your radar at the moment, gotten over herself, and graciously arranged another time for you to visit.

You find out who your friends are at times like this @user0346 . Obviously you opining on your this woman's renovations is so much more important than anything you might be going through. Has she always been so desperate for praise and attention? Was she there for you at all when dicky walked out? You're better off without the pair of them now that they've shown you where their priorities lie.

Best of luck moving forward and make the most of the genuine and loving support you do have

You should read the whole post. The OPs already called to apologise and her 'friend' has rather rudely told her how disappointed she is. Have some bloody compassion.

What an absolute bitch. Anyone who thinks “you said you’d go, you should have gone, regardless of being abandoned when heavily pregnant” is a selfish idiot.

She did apologise. Did you also miss the part where OP said she's pregnant and her OH has left her

Are you the "friend"

When was it discussed, did you make a loose plan a few weeks ago then have no further communication until afterwards? Or did you agree you'd go in the next day or two and then not show up? If this was my friends we'd have been messaging the day before to agree a time etc., when did you last speak to her before the planned meet up?

You should have gone, you didn’t go, and didn’t call, she was upset. You should apologise for not going as arranged (without any sort of “you’re a terrible person) side text. She accepts it, or she doesn’t.

People who give ‘house tours’ are the sort of people who know the cost of everything and the value of none. If I won the lottery and bought myself a princess castle I’d want my friends over to enjoy it with me, not to show off what I’d got. She’s a dick.

Did your other two friends end up going?

So your other 2 friends went round and you didn't? And no one thought "user3046 is having a really tough time, let's check she's ok"? That's quite sad for supposed friends. You're pregnant and your partner has left you not long before Christmas. A bit of compassion wouldn't have gone amiss there. I hope you've got good support from other places .

Take no notice.
Shes an entitled shallow “friend” who just wants to show off.
Dump her because soon you are going to be too busy to care and shes not going to be cutting you any slack then either.
Who needs this $h*t in life especially when you’re going through so much turmoil. Drop her.

A tour of the house. Not even any food. And she's bellyaching because you have a solid reason to give it a miss? I mean, obv not ideal to DNA but you've apologised and nobody was out of pocket or anything.

We are all bit part players on the stage of your friend's life.

^ This.

I didn't even know tour guiding in a new house was a thing. I've only ever been to someone's new house when there was an actual reason to go. She sounds mental.

Surely the house will still be standing for the foreseeable future. Unless she's some kind of 'flipper' who only owns a house to do it up then sell a month later?
All you can do is say you forgot. If that excuse means she'll never speak to you again then frankly it's her loss.
It's an odd way to behave frankly. It wasn't like she'd booked tickets for The orient express for you and you did a no show?

Had she gone to any bother with cleaning it and sorting food or even snacks?

I can see how it would be disappointing if you were sitting all ready waiting for someone to arrive and they bailed on you.