My first DD was IVF
(struggled to get pregnant, investigations, found 'unexplained infertility' was on my side, had one successful round of IVF/ICSI and had DD1 who will be 2 this month, then found out less than a year later I was pregnant with DD2 who was a complete and very welcomed surprise! She is now six months).
I found that one of my closest friends who wasn't really 'baby minded' just distanced herself. She didn't seem interested and it was as though she thought I was making a mistake having a baby. She's lovely to my DDs now, but I always remember that with the exception of sending some flowers, she never once asked how I was, if I needed anything or if I fancied popping out for a coffee to take my mind off things.
One of my other closest friends had successfully had IVF and she was incredible! She bought me this:
http://etsy.me/2b3mPQS
I think you'll get them cheaper on eBay maybe but it was such a thoughtful gift. It's basically a diary to document the journey, the dates of medication and injections, retrieval and so on. I found that during my two week wait it really helped to fill it in and focus. She also bought me a card to wish us luck on our journey, mug, a little packet of chocolate, a pencil case full of colouring pens and an adult colouring book and again, it really helped to take my mind off thinking about what was happening.
Another close friend would text when she was due to finish work to see if there was anything I needed picking up from the shops. During your two week wait you're advised to rest as much as possible so I was working from home and I literally just lay on the couch all day while working, and made sure I ate and didn't eat all the food from old wives tales 😂
The best thing you can do is to wish her luck, tell her you're there if she needs anything, offer her your support and check in regularly. Once the collect the eggs my clinic rang up every day to give me an update on how they were doing, and it was really sad hearing about eggs that had died off and weren't looking so good. The day they put them back I found really emotional,
So maybe key days like this (if she lets you know when they are), just drop her a text again wishing her luck, and tell her you won't bother her as it will be an emotional day but ask her to contact you when she's feeling up to it. I had a few messages like this and I found it really helped that the pressure was off me to reply to anyone and I could just respond when it felt right to do so.
You seem a lovely friend for posting here about what to say and do so I'm sure whatever you do, it will be appreciated! Best of luck to your friend 