I also suffer from gerd. I try to avoid the obvious acidic foods like pineapple or lemons, although I eat some occasionally. I refuse to give up tomato sauce though! While it is cooking I add a big pinch of baking soda and mix thoroughly. If I eat it this way I do not have reflux. (I also add to ketchup) Also, eating smaller meals really helps too. I sometimes have trouble with high protein foods like faux meats, so I eat small amounts at a time. I can only imagine if I ate real meat how much worse it would be!
I was treated with all the usual drugs years ago, all those so-called acid reducers. Those drugs actually make the problems worse, causing more acid once they are discontinued. They also caused me a great deal of lower abdominal pain.
The greatest discovery I made was Aloe Vera juice. This has been an absolute miracle for me. I simply drink 2 ounces after meals and within minutes it stops the reflux. Of course I had to get used to the taste, I find it to be pretty bad! I don't know if your daughter would even want to try it, but I swear by it.