Does your bit fit correctly?
You should see 2 winkles on both sides of the mouth
Is your noseband tight enough?
Too loose of a noseband gives the horse the freedom to put their tongue over the bit. It should be tight enough that you see no air in between the noseband and their nose.
If both of those are correctly fitting...I would recommend trying a different bit..maybe a little softer if able or try to find a flash noseband.
Really I don't know. Ever since I have gotten her she puts her tongue over the bit. I was thinking maybe getting a bit that just has a straight bar. I have a crub strap on it and everything. I just don't understand it. It fits perfectly, its tight enough, yet she still gets her tongue over the bit.
Hmmmm well I dunno. It seems a change of bit wouldnt help really. If she can get her tongue over a well fitted bridle so consistently I doubt a new bit would make any difference. But I could be wrong there. Sorry I can't be of more help to you