Welcome to HealthcareMagic forum
I empathize with your daughters problems and hope the surgery helps her get back to normal life.
As far as recovery from spine surgeries is concerned, the period varies individually. 3 months is usually the average period. This would include the time when she will be on absolute bed rest
It is always better to discuss this and other issues about surgery, complications, benefits of the surgery before hand with the operating surgeon.
Hope this answers your query.
Wish her good luck!!!!