Hm. I agree with the other posters she might should see a dietician. I'm thinking she was a little out of sorts and didn't ask many questions of her doctor, maybe she should call him/her back up and ask some follow-up questions. Certainly her doctor did not say she cannot have ANY carbs. Carbs are in all vegetables too. Celery? yep. Carrots? yep. Green beans? yep. etc. If I had to guess (and it IS pretty much a total guess), her doctor told her no more simple sugars/carbs, i.e., NO soda and NO sweets. No cake, no cookies, no ice cream, no candy bars, no lollipops, no bubble gum, no jollyranchers, no white bread, no plain white rice, no plain baked potato, no simple sugars no simple high Glycemic index carbs.
She can have eggs and berries for breakfast daily and not ingest a lot of carbs/sugars. But eating a bowl of cereal would be a no-no. Eating a banana or an orange is a carb heavy breakfast. Fast food french fries are WAY not allowed.
She can eat salad and chicken, or tuna, or even burgers with only half the bun but no fries. No soda with it.
It sounds like that is going to really upset her lifestyle. But it isn't that difficult to cut out those sorts of things. She can roll up thin slices of deli ham with a piece of thin sliced cheese with a little mustard and stick a few in ziplock bags. My kids take that sort of thing to school for lunch. Just put it in with a cold pak. Cheese sticks (individually wrapped) are GREAT for packing and snacking. Peanut butter is a wonderful low-carb/good protein food. Spread it on "light" bread (light breads average 8 grams of carbs per slice--read the labels) that has been toasted. Or Pimento cheese on light wheat toast. They are yummy, easy and low-carb friendly.
Buying low-carb tortillas is an easy way to have a low carb meal: soft tacos! black olives, sour cream, lettuce, cheese, ground beef and salsa have very few carbs--all except the salsa are virtually carb free!
She should call her doctor back and get specifics about how many carbs he wants her to limit herself to, and maybe follow up with a dietician. Then she can look for some low-carb cookbooks. There are a lot out there due to the Low-Carb/South Beach diet crazes.
Any kind of nuts are great snack foods. We love almonds, walnuts, hazelnuts, pumpkin seeds, and peanuts.