My previous horse sitter didn't really have a problem with my other guys (Scribbles and Rambo) as Rambo is really a push button horse, very talented but just a very easy ride. Scribbles can be a little stubborn and he's big so he's strong, but I can fairly easily teach people how he likes to be ridden and he goes fine. I REALLY am not comfortable with her abilities with Cash though. I think he's too much horse for her, and he's not the kind of horse I can leave for a week without him getting worked under saddle at all.
Because of this, I've asked one of my students to horse sit for me. She's actually a fair bit younger than the girl I work with, but she's a VERY talented rider and extremely mature for her age. She's ridden Cash before and handles him very well. Though she's never been on Scribbles or Rambo I have no doubt she can ride them. My problem is this, my previous sitter has caught wind that I'm 'replacing' her with a younger rider she doesn't seem to believe is better than she is. I've tried telling her that it's only because Sterling (student) has ridden Cash before, not neccesarily that I look down on her riding abilities, as I'm trying to stay polite.
She's worked for the barn longer than I have, and is a bit more favored by the boss than I am (she sells horses, even if they're sometimes out of their riders league; while I'm really not that aggressive selling wise) and having bad blood between us really isn't good. I'm a bit at a loss for what to do :\