I am so sorry, Plenty.
My two cents: I appreciate that you love her and tell her so. I appreciate that you and your parents have set boundaries and holding firm to not letting her stay there and not giving her money.
She calls you, as you likely know, because she needs something, probably money or a place to stay.
Since you are not going to give her either of those things, I'm not sure what the point is of taking her calls is. It is just upsetting to you.
I would consider blocking her.
That's tough, I know.