It sounds like you are doing all the right things -- watching her like a hawk and planning to call the vet first thing in the morning. I would think that she should be over the emotional trauma of being stolen from your yard and then being returned. It could be some physical trama that is still going on -- her leg could be hurting or she could be physically exhausted and is still recovering.
I'll keep you and Izzy in my thoughts
and prayers
and wait for the next update.