Sims keep freezing

It happened a few times where my sim would freeze (stand completely still without any movement) when I played yesterday. After a few resets it would fix itself. But when it happened again today no amount of resetting her or her horse (that she was interacting with at the time) fixed either of them. Another sim in my household was fine during that time though. It was just her and the horse that froze and refused to move no matter what I told her to do.

I have no CC or mods, and have never had any installed. Nor have I ever messed around with any game files. Is this a new game bug that came with the latest update or just my game? This has never happened in my game before.