There is a mare I know that was sick last year, and so had to have many unpleasant things done like being handled and checked out a lot and given medicine. She has always been a very sweet horse, but all the things that were done while she was feeling so sick made her grumpy and she got into some bad habits. When someone goes up to her she will lay her ears back and often threaten to bite. She will turn her rump and try to kick as well.
What would you suggest in a situation like this? Is it best to just feed her treats (she seems fine then) and try to get her happy with people again or should she be slapped whenever she is trying to bite or kick. Since she already isn't too happy with people I don't know if slapping her would make her worse or not. But it isn't ok for her to be doing this either.
Any thoughts would be much appreciated!