We had a momma cow that struggled with low calcium after giving birth. We brought her up to the barn for a couple of days. My husband reintroduced her and her baby back to herd today and the cows mature daughter (who aborted her baby 2 months ago) ran her mom around and was extremely aggressive towards her. Not sure if the daughter is in heat or just being a bully. We currently have them separated again and in adjoining fences and will attempt again this weekend. Any suggestions?