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If the thigh is visibly swollen, then I would get an x-ray of the leg. That will rule out any fractures. If she's still able to put weight on the leg, then it's not likely fractured, but an x-ray will tell you for sure. If it's just a muscle bruise with swelling, then some pain meds and rest should get her back to normal within 7-10 days. I would use an anti-inflammatory medication like Rimadyl.
If there is a fracture, then surgery to repair it may be needed. Any fracture of the thigh bone (Femur) will typically require some type of internal stabilization. Hopefully that is not the case here.
I hope this helps, let me know if you have any other questions.