Then all you have to do is say what you just said here. That it's not an excuse for things you have done, but it is a factor in the why you did what you did. And that you take responsibility for things you have done, and you are working on a treatment plan, and ways to help you make better choices for yourself, despite the effects that this disorder might have on you.

Main point, you are trying to do what you need to, for a better life. And that's really all most parents want from their children, they just want to know that they will be ok. Hopefully she will see this and your actions towards getting better, and will be able to offer you positive support.

It might take time for her to understand, or deal with it, but I hope she will, for your sake.