[Knave]

I would probably if I were you. She is your first horse, and someone there to help you, even just for a small time frame, may make all the difference for you. It doesn’t sound like she’s mean or anything by what you have said, but just a little hands on advice could do wonders.

Plus, a trainer could see how actually herd bound she is, and advise you on what needs done.

 

[Zimalia22]

She's married up to the rest of the horses. If you had more experience you would be able to handle this, but since you're still pretty much a novice, she knows that, and she's getting away with it.
I agree with @Knave, get a trainer. You need someone to help you get her back to the mare she was a year ago. And someone that can advance your horsemanship skills as well.
Best of luck!

 

[PoptartShop]

I would definitely get a professional to help you. This way you can also gain some confidence back, since I'm sure it has been hindered. Some guidance never hurts. Good luck!!