Yesterday I was letting my mare graze around the barn while I mucked her stall. I let her do this often since theres nothing dangerous around there for her to get hurt on(but of course she found a way). She was eating some grass and put her head right under the board in the fince, I didn't panic because I knew she could just back up and pull her head out. When she went to lift her head she banged her poll hard on the board and trotted off. I wouldn't have expected that but it's my fault regardless for letting her out. Should I be worried? She's acting totally normal today, is there a high chance that she's now out at the poll?