an 11 to 12 year old cat is certainly not ancient. (Monte is almost 13 and I am certain he could adjust to a trip across country OR new surrounding, if he had to)

But the fact that you will not be home is what would worry me. I would definitely either 1) Get her while you are at home or 2) Have her stay with another human until you get home.

I too am glad that you said you would take her, but I truly believe she should move with her family.