I think she should absolutely get rid of the snake, but I also don't think you should take advantage of your friend. What I propose is, GIVE IT TO ME!
I'm sure you will not go for that so my second idea would be try to explain to her that these things can and do happen and your not a real snake owner until you get your bite badge. Explain to her and help her realize that she didn't loose a limb and she turned out just fine. Then if she is still dead set on giving it up, take it. Offer what you think is fair if you feel so inclined, but if she refuses money just give it a good home and let her visit.
I would also examine the events that led to the bite and see if you can explain why the snake bit and teach her not to repeat the process.
Is this her only/first snake?