I had a stillbirth last April at 24w and hope this helps;
The best things that people said to me were 'I'm sorry' and 'I love you'.
She will be in shock and i didnt find it useful to be bombarded with regular messages at a time where i was struggling to comprehend what the hell had just happened. Some took it as an invite to check in daily, i blocked them temporarily as i just couldn't deal with it. So be mindful of this if you arent getting replies. It us a lot to deal with on top of decisions and practicalities like funerals finerals6and follow ups at the hospital. She will also be hormonal and tired which makes even the best-intended clumsy comment so upsetting.
'How are you doing' was much more easy to answer than 'how are you' as it went up and down so much in the first few days and weeks, almost by the hour. You are also inviting her to talk about it if she wants. I appreciated hearing and talking about normal stuff though as well.
Tell her you want to hear about her baby when she is ready. Only one person asked me my baby's name.
Take things to eat /freeze/ reheat.... we lived on toast for about a week as had no appetite to cook or eat. Don't go unannounced or stay unless invited to. For two months i only let one close friend and the bereavement MW through my front door. It was easier (with time) to see people outside so i was in control of when i had had enough.
Things not to say:
Will you try again? (I am 29w with my rainbow but he will never replace my first baby and this just dismisses it as trivial, this baby lived for several months and will be missed forever)
Things happen for a reason (made me want to scream!)
They are in a better place (no!)
Hope you are ok? (The answer is also no....)
You are so strong/brave (not true and there is no alternative, you don't choose to be in this club)
You must be feeling so 'insert adjective here' (pissed me right off, unless you have bern there, you have no idea)
Sands has some good resources. You are a great friend for wanting to support her as it is such an isolating time. The online community is great and thanks to MN i am in a FB group of other stillbirth mums who are all amazing. DM me if i can help x