Thanks for your suggestions!  I looked at the list of certified rehab locations and there is actually one nearby!  I will look into that.  I think she would wear a harness but I'm not sure how well she would like it.  She is a very independent b***h (said with the most love; she has an attitude and we love it!) and has historically been resistant to help but she's actually gotten very good at accepting help since amputation.  She actually does much better with me than my husband.

My husband got Lila as a rescue so we don't know her actual age, but putting together how long he's had her and how old he thought she was when he got her, his guess is that she is 12-13 years old.  Our vet said this is probably pretty close. 

When I took her in for the UTI I also talked to my vet about her mobility issues and he put her on gabapentin and recommended glucoasmine and fish oil.  I just received the glucosamine last night so she's started on that now.  The UTI was treated with amoxi/clav.  I stopped in yesterday because my vet had requested a urine sample at the end of the antibiotic run to make sure the infection was completely gone (almost but not quite, she's getting another week of antibiotics to make sure it's good and gone) and while I was there I updated my vet about her condition.  He decided to add in a week of deramaxx; he said that if she has drastic improvement on that it will rule out certain types of chronic pain.