My first born, my son, died a few hours after he was born due to me having severe HELLP syndrome.
Everyone reacts differently, but for me, I wanted desperately to talk about him, to look at his photos, and I was very grateful for those people who supported me with this and sat by me and allowed me to do just that.
I know this is not for everyone but I found some comfort in understanding what had happened to me, and why, so I researched and found groups and read accounts of other peoples experiences.
I also connected with SANDS which were invaluable to my recovery from what happened to myself, and my son. Their befrienders are mothers who have been through the same ordeal and I also read their books and found my local SANDS group where I connected with others who understood my pain and grief. I don't think I could have come out the other side of it if it wasn't for SANDS and the connections I made there (and also my Mother, but that is a different story)
You will need to navigate your friend and be led by her. She may want to talk about the baby and what happened. If she does, be there for her, hold her hand and talk with her about it and listen. Hug, cry with her if you need to.
She may want to hide away and not talk at all. If she does this, then gently just let her know you are there for her when (if) she is ready to accept some help. Just knowing you are there for her will be enough, I am sure.
What ever you do please don't say 'you are young enough and can have another one' or any of those really unhelpful things that people say that think it helps but it doesn't! Someone said it to me, in goodwill may I add, but I just wanted to scream at her that 'I don't want another baby, I want THIS one!'
You sound a lovely friend. I am so grateful to mine for the love and support they showed me 🌹