I think babies go on instinct so if she cries a hungry cry then she is hungry.

I wouldn't worry about baby weight or chubbiness because she will slim down once she crawls, walks and gets moving.

Personally I would feed her if she seems hungry. She is just a baby and she could be going through a growth spurt.

I had a girl who ate tons the first year with me and suddenly at 2 years started saying she was full or leaving half her lunch and slimming down. During the first year....I was worried that I was overfeeding her because she would want 4 servings of lunch etc but now that she seems to be slowing down her growth she is slimming down and she listens to her body.