myyy 5 year old pony is usually an angel when it comes to tacking up, and was slowly being less stroppy when it comes to riding... but recently when it comes to tacking her up, she has started to kick out and bite.. i know her tack fitss fine and her backk is good too.her rug had been rubbing her, but soon sorted tht out and it is now scabbing over. So at first i thought i would be nice as she is only stroppy cuz it is uncomfortable, but now she is started to taking advantage and pulls her head away when it comes to her bridle.. at first she kicks her leg out wen i bring the saddle towards her and turns round to bite when i ignore her. then once the saddle is finally on, i turn to do her bridle and pulls her head away, turns her bum on me pushes me into the fence and then kicks out. this is started to get me nervous as she is an angel once the tack is on.. what should i do ???