If she's growing apace, not too skinny, etc., then don't up her food. I feed the same food, and the bag says that the amount goes DOWN as they get older and their growth rate slows. You're already feeding her more than the recommended amount for her age/size (50-69 lbs @ 7 months = 3 1/4 - 4 c.). If you up it, you simply risk having an overweight dog. My pups scarf their food down lickity-split as well, and they're ALWAYS ready, willing and able to eat anything else that might be accessible. LOL.
If she's SUPER active OR if she's too thin, then she might need more food (or she might be ready for/need something with a higher protein content). My beasts are total couch potatoes, so I don't expect to run into that problem myself.