My baby fell off my bed

This morning my (in 2 days) 11 month old fell off my bed. Thank GOD she is okay, she has a red mark that could possibly turn to a bruise- right smack dab in the middle of her forehead. She cried for about 2 minutes after it happened, I put ice on her forehead right away, and after she calmed down she played and smiled just like her normal self for about 2-3 hours. Even though she is okay, acting normal, and happy as ever- I can’t help but to still beat myself up about this. How could I have let this happen? I was right there. I just didn’t move fast enough. I feel so guilty and can’t help but to believe that I am now a terrible mother. Even though I know I’m truly not, I can’t help but feel this way now.