Hi Lilka as I am not yet an adopter I am sure my thoughts are not as focussed and feel free to ignore.
How are you keeping in yourself?
Regarding your DD2, to me it does sound like she is considering contacting birth mum again. Whether or not she does may depend on how she plays out the scenario herself.
Has she got any new therapy in place? I am guessing that none has been offered. Delighted if proved wrong. It seems crazy she had this bad incident recently and has not been offered any.
I wonder if her relationship or lack of it, with birth mum, would be a thing you, DD2 and her therapist could work on, how to have or not have a relationship with birth mum? It may be that it is all wrapped up in how she feels about herself and she will continue to bash herself against that relationship while trying to work out who she or her birth mum is in all this.
This is, of course, no reflection at all on your parenting, you are a stable constant and a source of peace in her life (I expect very much so), her birth mum is not, but she is part of who DD2 is/was/ in some way.
DD2 really should have a safe way to work this out and it seems she has chosen Sims. That is OK as far as it goes but Sims can't really help her think outside of her own experiences. How would it be for her to put boundaries in place, to experience a friendship with birth mum that is more like an auntie or old family friend than the one she attempted before which was more like a long lost mum/big sister/best friend etc.
Does that make any sense?
A skilled therapist could help her (maybe) to see how she can have a relationship, virtual, long-distance or other with her birth mum without it turning into a combustible fireball.
Maybe she can't have a safe relationship with her in real life; maybe a therapist would help her see that. Is there any way she can get the help she needs?
I am sure you are doing such a fab job.
Are you looking after yourself?