Sounds normal to me.. Remember they don't all become these calm placid puppy dogs. I've got a few that are a challenge. Wait till they get to be 2100 grams and stand up like a Texas Rat snake with their mouth open.
It simply sounds like she is telling you she is warm and happy and doesn't want to be messed with.
When you've got 10,000 people trying to do the same thing, why would you want to be number 10,001? ~ Mark Cuban
I have 3 that are all like that and weigh a little more then that.. I was wondering what it was myself. They are eating machines mind you so if they have the attitude which goes with the strong feeding response I'll live with it.