I’d set your expectations pretty low to be honest, this will be an incredibly difficult meeting for her (and you) and while there’s lots of things you’d like to know, the reality she may not cope with lots of questions. I’d think of two or three things that feel very important and send them to social work before hand so she has time to think about how she’d like to respond. I’d avoid anything too personal to her and wouldn’t be trying to explore medical histories etc, that’s part of the work done pre-placement and if health and social work don’t have it, she’s not likely to share it with you in one meeting. I’d certainly not be asking “baby book” type questions not least because depending on her state of mind at the time she may nit know the answers, and while it wouldn’t be your intention, it becomes another reminder of how bad a parent she was in front of the person who has her child.
In my experience, being in the same space as each other and you seeing her and her seeing the person that will be raising her child is valuable in and of itself - anything else is a bit of a bonus. Think too about what you’re prepared to share with her about you - she’ll have questions too and if you can get them ahead of time it’ll help you prepare.
I would like to ask her questions about what happened for the situation to arise but I won’t. It would seem too judgmental and I’m not sure we would hear the truth.
With respect, this is none of your business, you have the information provided to you by social work which they’ve deemed fit to share. It would be hugely inappropriate to ask her about that part of her life and I’d expect whoever is facilitating the meeting to put a stop to any such questions - she’s a person who has had significant challenges and you’re a complete stranger to her. Treat her and her story with respect.
It’s understandable that you want to take advantage of the opportunity to meet her, but remember in all of this she’s a mum who has lost her child - regardless of what you think of her part in that. I’d be planing to just go and see what happens and take the best from it.
Be prepared for it to be harder than you think - sitting with a woman who has had her child removed is very difficult and emotional. Make sure you have some support for yourself afterwards.