My Wife Was Prescribed Cephalexin To Combat Possible Leg Edema

my wife was prescribed Cephalexin to combat possible leg edema due to possible infection after a severe ankle sprain was ignored by her and her right leg developed severe edema along with severw pain. Her right leg has ballooned, starting at the ankle and had work its way up to her knee. Her other meds inllude 15mg's of oxyxodone and 30ms's of morphine to treat l1 through l5 disc problems due to advancing age(62) 3 oxy's a day and 3 moprpg's a day and has developed vomiting and stomach pain. X-rays and ultrasound reveal no DVT in the leg. I feel like a ping pong ball, being sent to so many doctors. Any ideas on the edems which also causes her to lose her balance to compensate her walking around?