Would you get upset too?

So my horse got sick with colic at the end of march, really sick, he was kept at the vets clinic for 3 days On fluids. Thank God and knock on wood he had been fine since however he lost about 75 lbs. He also needed his teeth floated (which were just done ) and I didn't want him ridden until he gained his weight back. Now my mom and her business partner own the farm I keep him at, and "together" all 3 of us were supposed to run it. Ive since been slowly excluded from things because I choose to move it on my own. So today my stepson tells me he walked my horse back to his stall after someone had done something with him. This kinda made me upset because noting is supposed to be done with him riding wise. And they knew it. so then my mom came down to our indoor after I was done teaching my linn and told me how they had this girl who's a border ride my horse! I've told this girl not to ride him because he hadn't finished gaining his weight back. So when my mom told me she had this girl ride him I got upset with her. I didn't tell but told her flatly I said I didn't want him ridden.... AND SHE GOT MAD AT ME!! She jumped at me and told me well it was a nice day and and he's starring to gain his weight... I couldn't believe it. So was I wrong to get upset over it?