Well, I guess that makes more sense but I still don't get why she (herself) would purposely go back in time to get cancer. Is she using a DeLorean or the machine from The Time Machine? Here are two pics just in case you need visuals:
Doc Brown's DeLorean:
delorean1.JPG
Alexander Hartdegen's Time Machine:
the_time_machine_1.jpg
Also, how far back in time would she go? Is she going to start a chain smoking habit of some kind? I feel sorry for you, though. It sounds like you've had a rough childhood especially with the way you lash out at people you don't know online. If you need a friend, I'll be your friend.
Thanks for the clarification, by the way.