
My lurcher had had problems with his cruciate ligaments when he was younger, he was put on Rhymadil (sorry if it's spelt wrong) and was to have NO exercise for two weeks even toilet trips had to be on lead, the vet was very adamant that he was to rest the leg completely. After two weeks we then began to build up his walks by minutes every day and my OH, bless him, would put on his wetsuit after work and go over to the lake with him for a swim, again starting off at minutes a day then building up over time.
After the first leg got better a couple of months later the other one went, at the time I was spending a couple of weeks with my parents and even though I did everything the same (except the swimming) the leg got worse, then I found out my Dad had been taking the dog out on his lead in the morning before work (even though I'd explained why he musn't :( ). Mystery solved, the leg began to get better as soon as I'd put a stop to that and fingers crossed he hasn't had a problem since.
If we have been out for a very long walk he sometimes starts to lift his leg in a tell tale manner and to me that is the signal for putting him back on the lead and I take it easy with him for a few days.
I know I'm not a vet but with what I have experienced with my dog I certainly wouldn't be walking your girl at the moment, I would keep her in for a week with plenty of juicy bones and a stuffed kong.