I can't help you reach Dr. Luke, but I did consult her book extensively and saw a nutritionist in my own area who gave me a pamphlet she uses with diabetics that gave the run down on grams of protein per serving sizes for nearly all foods you could think of. It was very helpful to me in keeping track of how much I consumed. Maybe you could locate something like that from a doctor?
I was also vegetarian, but went back to eating meat b/c I was simply unable to eat enough to meet my protein needs without it. I was eating 4 to 5 times the amount of protein I usually eat as a veg. (And once those babes start growing, there's less room for food!)
Also, my nutritionist said that I could count any kind of protein (even protein in carbs, dairy, eggs, etc.). So, with input from my doula, ob and nutritionist, we decided on 120 grams total protein daily (from all sources). Each day, I wrote down everything I ate and totalled the protein grams. If at the end of the day I was too low, I made a protein shake with soy protein powder to get to the 120 grams. That might be an option for you too if you are committed to staying veg. (Each shake had about 30 grams, depending what I put in it in addition to the powder.) It worked for me . . . I had boy/girl twins that each weighed 7 lbs 4 oz. and were delivered at 39 weeks.
I also followed her advice on calcium and magnesium supplements, and drinking TONS of water, which I believe also helped me carry them to term.
Good luck and take care of yourself!