Okay, that helps clear things up. I'm glad you're not some stalker type dude who only peripherally knows this woman.
I'm going to try and put this as nicely as I can; horse people don't want
horse related gifts from nonhorse people. Horse gifts from nonhorse people tend to suck eggs, especially if they're a 'surprise'.
If you really
want to get her a gift, ask her for a detailed list (sizes, colors) of things she'd like, then go to a tack shop and ask the people there to help you. Seriously.
I'm an English rider. Rode saddleseat and English pleasure when I showed, and now I ride in Hunter paces and trail ride in my English saddle. ALL of the gifts I've gotten from nonhorse people over the years have been Western related.
Um, thanks? Nice to know you have NO CLUE what I do! Props for caring, though.