Oh no Kimmie, that is so heartbreaking.... !!!
I feel so sorry for you, knowing how much you love your daugher and her little Jenna... .

Are you sure your cannot try to be the legal parents for Jenna? I am asking this, because I know of such a case. My best friend in Missouri did this with her daugher's kid. Thre were no drugs involved here, just hatred from mom to son... . If you want to know more, tell me; I will send you more info in a pm!
Tons of hugs, my dear Kim!!