I was diagnosed at 17 like your daughter, I have grown up in western NSW and they told us that they would drop me as soon as I became an adult as the system changes so there was not much point.
I don’t know if this is a similar situation to yours but I thought I would reply as my relationship with my mum has been important in my recovery.
I have OCD, Deppression and an ED.
My relationship with my mum started to fall apart after my diagnosis, the psychiatrist made me feel very uncomfortable and to be honest I was lying at lot at that time. I was so scared. I wanted to tell my mum everything but couldn’t understand it myself and was so embarrassed. I took the medication my mum gave me but then began to feel suicidal and convinced myself it was the meds. I refused meds for two years after that.
maybe if you do make suggestions about getting help, talk with your daughter about different support to last time. Repeating experiences with services that have failed to recognise your needs feels hopeless.
Maybe you could research options together, talk about if the thought of meds or Therapy make her uncomfortable and if she gets upset just stay with her listen to her or if necessary change the topic.
This may not help, but I know how much it means when your mum keeps showing up for you long after you thought she should or would. I am so thankful for my mum and you are doing the right thing just by being there for her.
best wishes sea turtle