I hosed it off for about 10 minutes and didn't do anything more to it because I couldn't think of what to do off the top of my head. I'm positive she doesn't need stitches but I don't know if maybe she needs a shot or something because of it. If there's anything else I should do let me know!
Before hosing when it looked super yucky:
After hosing, a perspective view (she was standing weird, with it out behind her):
How do you think she did that?
That line down her leg below the gouge is a big long scrape/cut. She was moved into a new field with 9 other horses yesterday (she had been only with 2 others before but that field had no shelter and this bigger field does). They all had previously shared a fence line and she's been moved in and out of the big field about once every few months for the last 6 months without any problems previously so it's not like she doesn't know those horses.
The fencing is electrified tape and T-posts so I highly doubt she got her leg though it or something.
I'm kinda wondering if maybe she stepped on herself when she went to get up or something but that doesn't seem coordinated of her if that is what happened...
Is there anything I should change/do to help her heal? Thanks!