Sounds like she's herd bound. You should take her out everyday and just bond with her: give treats, groom, sweet talk her, hand graze/walk, etc. for a couple of weeks and do some ground work with her, especially before you ride her. I wouldn't ride her for a week or so and just focus on bonding a little everyday and gradually increasing the time you spend with her. Good luck! :)
PS: Does her saddle/tack fit her properly? She could be trying to get away from pain if it doesn't fit.
John 14:6 - Jesus said unto him, "I am the way, the truth, and the life: no man cometh unto the Father, but by Me."