Here is a PDF document that describes what can *typically* be expected following ACL/luxating patella surgery:
http://www.twincitiesveterinarysurge...cl-mpl%202.pdf
Although your dog is not supposed to be anywhere near back to normal for a few more weeks, she probably should have started putting her leg down at least a little by now. I would follow the recommendation of your vet and get the recommended professional physical therapy.