I agree that limiting carbs is harder for a vegetarian. When a meat or meat-fish eater says "I don't know what to eat that doesn't have a lot of carbs", I'm always kind of bemused. It's a lot easier for them, just eat your meat or fish with vegies or salads, etc. I was vegetarian before my diagnosis and when I was diagnosed I wondered if I'd have to give it up with diabetes. I didn't want to do so, but if my health depended on it, I would have. I'm happy that I didn't have to, though. This year it will be ten years for me as a vegetarian. I can't believe it's been that long; this is my second try as an older person, when I was younger it only lasted a year or two.
Anyway, I keep my carbs under 100 a day. This is as low as I feel I can go and still be a vegetarian and a "foodie". It works for me, but I also have a lot of time to cook, and it's one of my favorite things to do.