We gave heat medicine she showed white discharge for 3 days but we didn't noticed that time and it's been 15 days

Silent heat or a uterine infection is still likely. That white discharge after heat medicine means the womb was responding, but if breeding was missed and she is still not cycling properly, the uterus may not have cleared fully or the ovaries may be weak after the abortion. Keep her on good feed, mineral mixture, and clean water. Watch her closely morning and evening for standing heat, mucus, restlessness, tail raising, and bellowing. If she is not showing heat even after another one to two weeks, she needs a proper reproductive check, because after abortion some buffaloes develop uterine infection, ovarian inactivity, or a small cyst. Do not keep repeating heat medicine on your own. For a precise answer, book a Pashu Vet on Pashushala or call the Kisan Call Centre on eighteen hundred one eight zero one five five one. Treating this now is much cheaper than losing another breeding season.