BUT! I went XC schooling in it, just for the heck of it, and I definitely need more steering and brakes than a happy mouth. Remember, she didn't like the loose ring french link. So, I might try another bit for cross country. Not sure what to start with, but that's where we're at! Thanks for all the help!
I'd start with a Happy Mouth Pelham or 2-ring (riding with 2 reins), since you know she likes the mouthpiece. When you say she needed more brakes, what was she doing? Grabbing the bit and leaning, getting above it and running, or...??