Hello Heather, Sorry about your stepmother's condition, but you have come to the right place for help, information, and support. I don't know the answer to your question about it spreading so fast to the spine. What tests or scans has she had? (CT, bone, PET?) I think that she should get a second opinion re: what can be done for her preferably from a cancer center. Don't know what state you are in, but there is probably one not too far.
Muriel