dogs will eat until they vomit...its a dog thing! In the wild the food isn't guaranteed so you scoff it when you can get it.
Can you see her ribs and hip bones? If she has thick fur over ribs and hips, can you feel them easily?
That's the best way to judge how much to feed...if the ribs/hip bones can be seen or feel sharp under the fur then increase the feed. If the ribs and hip bones are not visible or feel chubby then reduce. Its hard to say how much food to give as dogs vary a lot. I have two pups who are litter brothers. One is always a bit ribby, the other slightly chubby, they are both fit and active and the vet is happy with both of them and yet the ribby one gets 100g of food more a day than the chubby one. The chubby one gets the recommended amount for the food.
if you switch her to dry food, she may find it more satisfying, you could also offer her a raw carrot to chew which is filling without fattening or rawhide chews.
My boys are now nine months old and only now am I moving them to two meals a day but they are a big breed....maybe going back to three meals might help.
I only mention this last because it is a fact, I don't want to scare you but the drink a lot wee a lot thing can be symptomatic of diabetes especially if pup eats loads and stays thin. Diabetes is controllable in dogs but you need to catch it early