Thanks to those who have replied so far.
Dani - My vet (who I talk to regularly) also encourages swimming and other appropriate exercise. We walk for about an hour every day. Fortunately we live close to a couple of lakes and when the weather/water is warm enough we take her pretty much every day. We also watch her weight closely and she is trim and well muscled. My Vet really emphasized keeping her lean. He also said that rough play with other dogs wasn't a great idea. Re signs of pain: She is mildly lame on one side at the moment, but I really don't think she is in pain....maybe just a bit sore. She's always had a bit of a weird/exaggerated gait, but hasn't been lame for ages. I think she may have strained a muscle when she was running the other night, but it's almost okay now.
Alpenalab - I hope that Axl can play soon. It's nice that he's had a smaller friend to play with. Dee plays hard when she plays so I've been hesitant to let her play with much smaller dogs than herself. She's good natured, but I'd feel terrible if the little guys got bumped around too much or accidentally injured. I'm not sure that she'd adjust her play to suit a small dog. She's still very puppy in many ways...though she's going on three now. It's hard to tell them no sometimes when they are so desperate to play, but I try to balance things as best as possible. :-\
gabbys mom - Yes, my Vet said that that is the worst thing.....another dog jumping on their hips. Makes sense of course. I'd definitely not allow that. You could be right about them being less wound up if they get to play more. I don't want to be "too" over protective, but at the same time if being cautious can save her hips from major problems :-\.....I'm not sure where to draw the line.
cinderbaylabs - Believe me, she is not a couch potato.

I know the importance of keeping her fit. I know she needs to have some play with other dogs, but I'm trying find the right balance. I don't want to allow anything that is unneccessarily hard on her hips and hastens arthritis setting in.
snowflake - That must have been really hard. Poor Annie. :'( Fortunately Dee is not that bad. Re keeping them thin....my Vet and the Ortho said the same thing.
birdbrainz - My Vet prefers doing a PennHip type exam/x-ray because it measures laxity whereas I don't thing that OFA does. It is also a better predictor of future problems. (for sure she wouldn't pass either anyway) I did see the x-rays but I'm no expert on reading x-rays....mainly went by his explanation. Per the Vet/Ortho the sockets aren't as deep as they should be (I could see that) and the ligament that holds the ball is place is far looser than it should be. He said she may never have an extreme problem...or then again she may need surgery at some point down the road. :-\ Time will tell. I'm trying to strike a balance. It's not normal "not" to let them play and of course they need the socialization...so I'm just careful not to let her over do it, but she is a real dynamo....VERY excitable when it comes to other dogs. My Vet said no "rough" play (that puts downward pressure on her hips). At the same time I think she DOES need to be a dog and do doggy things....a balance. She is on a green-lipped mussel product and has been since we found out her hips weren't great. I'm not sure how beneficial it is because she really hasn't had any "major" problems. If she had been really crippled up and improved I'd know it was working, but at this point things have remained fairly mild. She has always had an exaggerated sway to her gait...not sure how much of this is down to her hips. I want to do what is "all-around" best for her. Thanks for the tip re MSM. I have heard that it's good. Maybe I should try it myself. I also have some a/i issues and arthritis in my back.
I don't want to be over protective, but I think if I don't restrict her play to a point she may end up with far worse problems than she has right now. I think she would keep playing even if she was in pain.
I so wish there was a genetic test for this because it is FAR too common still, and I'm puzzled as to why people don't chose PennHip over regular x-rays. It sounds like the way to go.