That's got to be it!
Some kind of off-brand Polly Pocket compatible item then, wow!
Thank you for posting this photo, that's got to be what it is from. Such detective work, I would not have guessed such an off-brand would have a quality like that. I love how there's a little bar & sofa for the horses, it's so weird and quaint.
Thank you for solving the mystery!
Stuff like that, where I get it and don't know what it is keeps nagging me, but now the mystery is solved.