I kinda want her to get human hands because of the power of yuri. Maybe the last panel of chapter 4 was that?
Something like the plot of the beast who needs someone to love him truly and he turns human again.
I wouldn't really like that. I don't want a plot that says that love can do anything, but one that tells the reader that love can go through an illness without healing it. That the healthy girl can fall in love with the tree-girl don't matter if she is "strange" o whatever, and that being totally normal. I think it's a good message.
But is only my opinion :) .