D.T.
there are plates a child can suck on to keep them from teeth grinding. When you notice it and she's awake, try to engage her in something soothing like blowing bubbles or petting her teddy bear. Some people just have anxieties that cause them to clench their jaw or grind their teeth. Be as unemotional as possible about this and try to avoid using your standare "hurting mommies ears" because then it could be used as a tool of revenge.
Also anxieties can affect the esphogas and cause regurgitation. I would suspect a very sensative gag reflex first. Try mylacon drops before a meal. A doctor can prescribe liquid Zantac, Tagamet, or Nexium too if this continues to be bothersome. Again, I would suggest you handle this as emotionless as possible because she could "do this to her self to get attetion" later on.