Here are 2 good suggestions:
1. Narcoosees has an entire vegetarian menu (or at least they did a few years ago). It is a separate printed menu that you can ask for. In any event, on their main menu they have a vegetable platter as a main entree that is delicious - it is huge and comes with risotto plus a sampling of their many wonderful vegetable dishes. This is a winner.
2. At the California Grill, you can order veggie sushi rolls. They make sushi that is not on the menu if you ask for it. Also, they will make the flat breads with vegetables and no cheese.
3. Jiko - has a grains entree dish that my mom ordered. It was beautiful and delicious and she loved it.
Most of the restaurants have good salads and if you ask, they will make her an entree/dinner size salad.
Hope this helps.