What would you do? Crazy lady simultaneously demands I get out of her parking spot but has me blocked in and won't back up so I can get out.

I drop off my delivery. I am parked in somebody's covered parking spot with my flashers on for about 1 minute while I drop the food at the door. ( Parking lot was packed, No place else to park. ) Lady in her fancy new car pulls up behind my car while I am taking the picture of the food and starts honking her horn and yelling for me to " get the fuck out of her parking spot ". I run back to my car to back up and leave and she is like ten feet behind my rear bumper and I am surrounded on all sides. I put my car in reverse and back up as far as I can. She won't back up. Instead she continues to honk and yell. After a few minutes of abuse and backing up 1 inch at a time she still won't move. I put it in park, get out and approach her asking how the FUCK I am supposed to get out of her spot if she won't move and let me leave. Pleasantries are exchanged. I get back in my car and yell back that we can both stay here all night. She says I have no idea who she is and goes and gets something from her trunk. I get something from my own center console. Bright lights shining in my rear view mirror, she still won't move, and I am expecting the shootout at the OK Corral at any moment. I finally escape by making a 25 point turn gaining an inch at a time every time I go forward and back. More pleasantries exchanged on the way out. FFS man. I'm just trying to make a living out here.

"Be kind, for everyone you meet is fighting a hard battle."