When she went broody a couple of weeks ago, did she pull out her chest and belly feathers when she was sitting? Some of my hens who have gone broody will have a fuller puffy but soft crop. They also stop laying for a couple of weeks after being broken. The meds all look good—clavamox, a good antibiotic, meloxicam for inflammation and pain, and reglan injection for slow to empty digestive tract. I would not massage the puffy crop, since that can cause her to regurgitate her crop contents. I think 
@casportpony can help you, so glad that she is here. She seems awfully young to be having problems, unless maybe she is starting to molt. Molting is really hard on them. Do you motice any messy feathers?