Lose the stick. And why at this age are you round penning her anyway, if she has done all you say she more than likely does not need it.
Old bones and joints hurt, and if you continue she will end up hurting herself and possibly crippling herself too.
There is no need for round penning in this case.
And if by stick you mean that idiot PP thing? Pitch it period. Most worthless thing I've ever seen.
She has displayed some dominate behavior and for me, with a new horse the round pen is a good place to start. Panning ears and trying to push into me/ run me over when asking her to turn can be dangerous when I plan to hand her over to my 10 year old. The round pen is a wonderful tool for any age of horse as long as its used as a training tool and not just to run your horse around in circles until he is exhausted! Join up is pretty awesome.
This is by far not my first horse. I've ridden since the age of 8, young, old and everything in between! I have decades of experience, I have been charged by spoiled, disrespectful horses before and let me tell you, it ain't fun! If she can trot and canter in her pasture she can also do it in the round pen.
I need to be able to control her body not just from the saddle but from the ground also. She needs to understand that I am in charge period. This is how I've trained my young horses and they respect me, look to me for direction, and allow me to do anything i need to do on or around them.
It's a training tool just like anything else. I use it as an extension of my arm no more and no less. Sorry that you feel it is a worthless tool. It's not a miracle wonder stick that some NH trainers try to push these days and many people have no understanding that it is not just a whip. Hence the issues I see in some of my rescue horses. But I've never seen such an over reaction. I don't think I'll be pitching it. I do think I will be desensitizing her to it! Thanks for your input!