I must have missed the word "obligated" when I read the original post and I can't take the time right now to re-read it so if, in fact, that word is in there as your motivation....I have to agree with Trippin.
Don't do it out of "obligation". Do it because it comes from a pure place in your heart (oh my God the corn ball level just shot through the ROOF here -

) but, hey, I
do think places like that exist in each of us - I don't give a damn HOW messed up or not anybody is. If it doesn't come from that place, don't.
Doesn't help her or you, though you may not feel that way for a while after you'd done something.