Karen, I agree with Jna. To have it at your spine is a very difficult thing. There are such a lot of extremly important nerves going through there. But don't worry. Now that they know the magnitude of the problem they will go carefully. It all depends on how long it's been there, if you are the least unsure you can ask them to get an outside opinion before they do something drastic. Also you should be sure to get an opinion of what different procedures there are to choose between.
If it's cancer and there is metastases (daughter growths) it will take quite some time to recover, and it will be hard. She will need a lot of optimistic support, don't you dare give up on it girl. She has you, right, and I'm sure there are a lot more people than you think caring.
You really need to have a good talk with her Doctor(s), so that you know what options there are.
And we all hope for the best.