New rabbit advice please

Hi, am a first time rabbit owner. Had my rabbit a few months now...and although is in good body condition she doesn't seem like a big eater. I give her unlimited Timothy hay and a handful of redigrass a day. She had all in one dried food and I give her fresh veggies every day. But she doesn't seem to eat much. Thinking maybe she wasn't keen on the hay I was getting but I have tried a few and she not much eaten. She seems fine in herself but worrying a bit about her not eating much. Any advice much appreciated.

How old is your rabbit?
What make and how much are you feeding in the way of pellets?

She is about five months old, feeding her nature's feast complete rabbit. She gets about half a cup full, although she never eats it all, just seems to pick at it..never been an empty dish.