Oh she sounds like fun.
My DD2 is exactly the same. 'But I'm not hungry for that. I'm hungry for this'. I rarely have any unhealthy food in the house because of this & when I do its up where they can't see it.
Almost every night mine won't eat their dinner & will be hungry just on bed time. Almost every night i fight about how they should've eaten their dinner, but I almost always give in & let them a sandwich, or apple so they'll go to bed
We have rules. If i have icy poles or something here, its one a day. Thats it.

Mine have been annoyingly hungry all the time lately too. Its finally settling down the last few days!