Stop being nice…
that’s why you are where you are with her in the first place. Put on your bitch hat. I goes something like this…
“LT, let me start by telling you that I really do appreciate everything you’ve done for Pookie and I. But, part of being here, for 15 years, is that I enjoy my time, with my horse. I am not a bff type of girl, if I had any spare time or emotions, I’d spend them on my SO. Please let me have my space, and please don’t make me regret giving you a recommendation to BO. I’m not sure what I did to deserve your undivided attention, but frankly, I don’t let anyone do for me and my horse what you’ve done, at least not without paying them (now here, you’ve relegated her back to barn help) and I’m not comfortable letting you give Pookie and I special treatment. Other boarders are starting to notice I’m getting all the perks, and they know I can’t afford to pay help and I’m terribly afraid they’ll start resenting me and make it hard on you as well. " I’m sorry if I’ve offended you, I’m sure you did everything out of the goodness of your heart, but I can’t afford the position taking further advantage of your good nature puts us both in, and I know you need to work here to stay here, so you can’t afford it either.”
She will have a meltdown. But, unless she is bleeding from a major vessel, just let her. She will give you the silent treatment, which is exactly what you want. She may still continue to shadow your rides, but really, unless she is interfering with a lesson or your ride, big deal, just ignore her. I used to use the “I’m sorry, I was so focused I didn’t even hear you” on people I didn’t want to engage in conversation. Would I make a little tape of the conversation? Yes I would, but, I think probably is that this is what happens in her life, time after time. She needs to be someone’s friend, you are friendly and she goes overboard. I’m sure you aren’t the first “victim” of her skewed idea of friendship and you likely won’t be the last. She sounds like she just doesn’t know how to have boundaries. You also, need to learn to set boundaries. The very first time she did a bath, trim, spa day on your horse you should have said “Oh LT , thank you, you must have been busy ALL DAY with 15 horses in the barn, how much do I owe you?” At that point, you had placed her strictly in the “hired help” category. You had other warnings, before the party, that she was way overstepping, but… because her helpfulness “benefitted you” you were willing to overlook it. As sad as it sounds, she showed you who she was, you just ignored the warning signs because it was nice having a clean horse and clean stuff. I can tell you that when the local barn LT did the same with my horses, she understood Very Clearly that she had a: overstepped her bounds, and b: knew if it ever happened again there would be hell to pay. There was no doubt in her mind where she stood with me.
That said, I don’t always wear my bitch hat, but I can put it on in a hurry. I once had a spoiled rotten, teenaged, hunter princess as a student. She was riding her own horse, who, arguably, went better in my bridle. Except that she didn’t ask me if she could use it. So when it came time for my ride, on my horse, I simply walked out to the arena, called her to me and said, come here, there is a problem with Lady’s bridle. When she stopped, I simply removed the bridle from her horse, and left her sitting in the arena, alone, screaming her head off. Her mother said “how dare you”. I told her two things, 1: if her daughter had asked, it would not have been a problem. 2: If her local schooling show daughter hadn’t had to have TS breeches and Dehner boots, she could afford a Pelham.
If you let people go past reasonable boundaries, well, don’t be all surprised when they turn out to be as crazy as you were afraid they’d be.