So away with that when I got her, and I decided to try something as mild as possible. A loose ring french snaffle. After buying her, obviously riding her more, I noticed she really isn't a fan of too much movement. It irritates her.
I think it's the rings more than anything. I don't think she would like a mullen mouth, and I want to avoid the nutcracker action of single jointed snaffles.
I'm considering an eggbutt french right now more than anything, I think she likes the mouthpiece fine, so I think that would give her more stability on the sides and thus less movement, but still the give in the mouth.
However, I am quite open to other suggestions, hence this post. I'd rather not spend a fortune on playing the lottery with bits, so I'm hoping to have some options to look over before I make any final choice.