Does it sound as if my dog's hip is injured/sprained?

I have a really awesome dog named MImi, she's 9-years-old, very healthy black lab/pitbull mix. I got her a new crate for the car so we could go conquer some state parks. We didn't want to put her in the crate while it was on the ground then pick it up. So, he decided to just pick her up and let her get into the crate in the backseat. But when he picked her up, she moved into an awkward position but got into the crate easily and laid down- had a great walk. Afterwards, when putting her back in by myself she seemed to start extended herself to either side, like stretching but it seemed like it was out of discomfort. Got her back home, and I noticed she was doing this a lot and there looks like there's slight swelling near her hips. I'm going to watch her today, seeing as this happened only yesterday, but I'm definitely taking her in to see the vet tomorrow. Any ideas until then?