She wont stop putting her tongue over the bit
So my little green Morgan mare has a habit I just discovered today. She loves and I mean loves to put her tongue over the bit. She used to be ridden in a full cheek snaffle and a D ring snaffle, she put her tongue over these (I was just told today), but when I bought her I discovered she had a low pallet, so I switched to a mullen mouth egg but bit. She is very nice is this bit.... On the ground. Once ontop of her, she played with it until she could get her tongue over it, then once she got her tongue over it, she kept opening her mouth and stuff because of course that couldn't be comfortable. I got off, fixed it. I tried dropping the bit a little lower, it was to low, she wouldn't stop playing with the bit. So I put it up one more then it usually is, and that was to high. So I returned it to the original placement, got back on. Then she kept trying to do it, and everytime I asked her to turn she shook her head (like she had bugs on her but didn't lol). So I had my mom sit on her and ride her while I lunged her so I could see it from the ground. She didn't do it then. But after speaking with the prev. owners. This is her habit. I don't know what to do at the moment. I don't want to put her in a bitless bridle, or anything like that. That really isn't a option if I can avoid it. She is also going to be a western and english horse. But western first.. :/ Help?