Filter Tags, Miss Harshwhinny

I've looked through the different buttons for filtering stories by characters and I've noticed that there is not a Miss Harshwhinny button. There's a Rumble button, a Fancy Pants Button, and even a Nurse Redheart button. Even though these characters are minor and were only around for maybe at most 2 episodes. Miss Harshwhinny was prominent for the Equestria games, we have an idea about her character then we do have for most minor characters. I also Like here character. So, why isn't there a character button for Miss Harshwhinny in the character filter? There are several stories on here about her or at least she's part of the story so why isn't there one for her when there's one for characters that only show up once?