This is a little long, but needed to give some background...
My best friend (for over 10 years) gave birth about two months ago. She told me beforehand that she thought she'd "disappear" for a while afterwards to have bonding time etc, so I have been in touch, but not pushed getting a response from her. I thought she was meaning about 2 weeks. In the past 2 months, she's been in touch three or four times, all of which were responses to me - which was fine, because she's having time to get used to being a mum (for context, before the delivery, we were in touch almost daily, but I obviously didn't expect that to continue like that once she had a baby!). Then I started to get worried that perhaps she had PND, so I emailed about four days ago (we live really far apart) to, gently, ask how things are going and haven't had a response. I didn't want to intrude with phone calls etc if she's not up to it, hence the email.
Just after I emailed, I saw a pic of her online with some friends and their babies enjoying a picnic. Then today, more photos of her with different friends (and their babies) - none of whom live close by, so it was definitely something organised and not a spur of the moment thing.
I also know she's been online quite a lot, because we use the same email provider and she hasn't 'hidden' her status, so it shows when she's actively online - if she's just left the page open and goes away, it shows that (I'm not stalking, it's automatic and I'm online quite a lot!).
Part of the reason I'm quite upset about this is because I'm in my last trimester and since i told her I was pregnant, my pregnancy has been looked down upon much in the way of a younger sister who is a bit annoying and sees starting high school as a big deal, when she's a 'mature' 16 year old about to sit GCSEs. That's a generalisation, because I don't want to list specific incidents, but I've essentially swallowed being patronised for most of my pregnancy, as she's someone I consider a close friend and thought that this was how she was dealing with her pregnancy - i.e. they were her issues and they'd be resolved once she gave birth.
Neither of the photographed events were things I'd expect to be invited to, so not feeling 'left out' - in fact, I was really HAPPY to see her looking happy and being around other friends.
I wanted to arrange to go and visit soon, but she kind of put me off with an excuse that didn't really make sense, so I'm supposed to be going after I give birth..probably, but she didn't want to commit.
AIBU to feel like if she had time to be around all those people, post photos of those times online, then it's not too much to ask to drop a simple email, even just to say hi and perhaps even to ask how things are going with me?
AIBU to think I've been 'dumped'? :( or 'relegated'? 
Or is it just my pregnancy hormones making me unreasonable?