all the above.... no caffeine, no fruit juices, no tomatoes (anything with high acidity) NO ONIONS, broccoli, no soda, no dairy - it is really very much like Crohn's and what foods to avoid... waht affect you ..may not affect me so keep a food journal to figure out which ones you need to stay away from.
here is a link:
http://www.mckinley.illinois.edu/handouts/pdfs/gerd_diet.pdf
(not sure why alcohol is not on this list as it relaxes the valve as well ... )
it might help to google "GERD DIET" I found there were lots of links that told me what not to eat and very few that says what to eat...
has your girlfriend gone to a GI if it is very bad?? They did a endoscopy and found I had a hietal hernia...so no diet changes would make that much of a difference... i am not at all overweight (they will tell her to lose weight is she needs to). I also had gastritis...
sooo
avoid any NSAIDS
all together... this can cause gastritis...
and try what others mentioned by sleeping with bed raised... I found I started to sleep sitting up by the time it got worse anyway... it relieved it a little Dingbats suggestion re: plain hot water was soothing as well....
Get her to go check it out as if left untreated it can turn in to Barretts esophagus.... nothing to play around with... GERD sucks and can be extremely painful - you are a nice boyfriend looking in to this for her. It is also embarrassing as the excess gas cant be helped.
and Aura... I feel for you - the PH test is unpleasant
(is that the tube down the nose test??)