C.G.
I believe stage 2 is just the combination of different foods that were jarred by themselves in stage 1, and just slightly lumpier. stage 2 is designed to be used when she is competent with eating, and it is determined that she doesn't have any allergies to the foods by themselves.
you may want to try giving her a bit of stage 1 fruit in the morning as well, to balance out her meals a bit, and then see if she's so hungry in the afternoon.
it's possible she may just be full, but try small first and offer her a zwieback or a biter biscuit before giving her another jar, that way it takes time, and she may not be all that hungry in the first place.
also, try putting a little bit of rice cereal in the bottle with the milk. I never really measured when I did it myself, i kinda just eyed it, but giving a tablespoon of rice cereal with the milk for starters, and adding more as you feel comfortable, will probably help fill her up, and most likely will sleep longer for you if you give her a decent amount before bedtime.