The owner of the store next to mine is aggressive and abusive

This situation has been going on for several years and is getting worse.
I own a business and the store next to mine, the owner does very annoying things like block my business by parking her car literally sideways across the front of my business preventing customers from parking there. She has started selling exactly the same products as what I sell.
Price cutting on the products I sell. Gossiping to my customers.

She is a horrible neighbor.

I am not leaving my store. She is not leaving,either. This is very difficult. I feel nervous going to work . Naturally, I can not change her or how she chooses to show up. Not sure how to get through this situation without buffering? How can I see this so that I don’t buffer myself to death?