DDH open reduction, spica removal. For?

My 2 year daughter underwent a DDH surgery for her left hip. It was open reduction with small wire inserted to hold bones together. She was immobilIzed with hip SPica for 6 weeks and  now hip SPica and wire  has been removed. It's been 3 weeks after that, she is now moving her left leg but most of the time keep in the position shown in picture. 1. When will she start moving her left leg freely ? 2. We used to pick her in our arms with one hand around her shoulder and one under hip . Most of the time it's ok she is happy with that but sometimes she starts crying because of some pain. We are not able to understand where it is coming from ? 3. What precautions to take after spica removal. I am mainly interested in understanding what's happening in her body right now. If pain is there what it is for ? Please don't reply do psychio bla bla...