Me and my friend brought a welsh section a mare. We brought her in June, and she turned 5 in July. She hasnt really been ridden much as its been a nightmare finding a correct fitting saddle and bridle! When we first got her she was very pleasant, loving, ears forward, keen to please etc. We moved her to a new (nicer) yard with stables etc about 5 weeks ago. She was fine for the first couple of weeks, but recently she has become horrible!Kicking the other horses, escaping out of the field, begging, biting, turning her bum round to kick you and really nasty if you go near her whilst shes eating. Her overall health is fine and the dentist checked her teeth and she has 2 baby teeth that are wobbly and the dentist said to wait for them to fall out. I am really confused as to what this sudden attitude change is? Could it be because she is due in season? I have never had mares before, only geldings so not too sure on mares?? I would be very gratful for some advise.