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Oh no, that sounds like a reaction to her food. The tea will not help much unless the food causing the reaction is removed from her diet. People constantly ask me if I'm expecting a child because my belly sometimes sticks out so far.
I can tell you that the number one culprit for this is gluten. Had it been a food allergy, you would have known immediately upon the food touching her lips. If it's not an allergy, it's a sensitivity. Casein is another big one, and that's found in dairy and other animal products.
My suggestion is that you eliminate these two proteins from the entire family's diet. I know it seems really crazy, but that family support is what's going to make this change seamless for your daughter. Who knows, maybe you'll find yourself with a flatter tummy, too!
How old is she?

She is actually out on her own (28); she has never looked after her eating habits and big into chips and processed foods. I think she's finally ready to tackle the problem though. This is very helpful info!

That's great to hear! I'm 29, so she and I are peers.