Look after yourself here! Oxygen mask in first!
That’s the first thing.
In terms of telling SD, I’d be honest, open but understanding. Don’t pay yourself, don’t fudge it or lie to SD. She needs to cope with her Mum as she is, the reality. She needs to process it. If she doesn’t have the information or you ‘make it all right’ she’ll just be delayed the reality.
Social workers should help with surely?
I’d say, look we have a contact Centre available, your Mum can meet you in, but she has to pay, she has to be able to do it. She’s in a very chaotic place at the moment, and is unable to do this. It doesn’t mean she doesn’t care, but it does mean that she’s not in a good enough place. That’s not your fault. Addiction is a very damaging and difficult thing. Some people say it is like an illness.
I’d talk more about what she knows or thinks, give her books to read that might help, get her young minds and child lines number. Be patient and open.
I guess that this is probably a marathon, not a sprint, and your ability to just be normal, to treat her like a normal kid, is key.