LOL Dee, my Fiona was just the same. As long as you are sharp and nip it in the bud if anything is directed at you, just let the adult horses handle her mischief as they see fit. They tend to be extremely tolerant of babies for the first few months, and Fiona got VERY bossy - it was funny to see her chasing big Claymore across the pasture, and he'd just run away from her. I'm sure it has some kind of basis in intinct/learning herd behavior. They didn't really start disciplining her until the 2.5 month mark, but now they give her a nip and chase if she gets bratty. I've really enjoyed watching babies grow up within the "herd" rather then being segregated... it's fascinating to me to watch herd dynamics develop. You'll probably notice in the next week or two Mystie will develop a "babysitter" personality to give momma a break to nap and graze, that's what happened with mine, though I was surprised Finn, my yearling stud colt (and Fiona's big brother) was the one that became babysitter in my herd - I would have though it would be my Misty, the only other mare I have. Fun stuff! Rain is a beautiful girl!