Hi and welcome!
We talk mostly about pwBPD (people with Borderline Personal;ity Disorder) but we have members who are coping with people who have multiple diagnosis' and the coping tools and strategies we talk about here are useful in any relationship. Basically what I am saying is that you are in a good place to learn strategies.

What sort of issues are you hoping to help with? Is your daughter getting support for herself as well? What are some of the issues you see?
As you share more, we can more easily make recommendations.
I hope to hear from you soon.