Wendy, One thing I had with my Diamond was that when she was discharged (we went to OSU too from NJ), we got home and she was already starting to feel too good and tried to do things she wasn't able to do. Like stairs.
So, if you're thinking you're going to have a dog that you have to carry, and lift and whatever, you may be surprised that you need a sling to SLOW her down.
I would say by the weekend following her surgery she was not having anything to do with the car ramp (the ramp to the outside back yard she used exclusively) but to get into the SUV, she hopped in by herself. She told me she wasn't an old lady invalid.
But I did make her do the ramp coming out. Luckily I never liked my girls jumping constantly from that height so all of them learn to wait until the ramp is in place before they exit the SUV. That's just standard.
You have all my prayers and white light coming in your direction for an uneventful surgery and recovery.