I know, Gladis is a bit so, so, but it's her paddock name isn't it (not her 'show' name)?
Does she respond to it? If she does, I'd be inclined to leave it. You do get used to it.
We had an OTTB named Bangers. I didn't like it, but he came to that name and knew who you were talking to using it. I did give him a flash competition name but kept Bangers for his everyday one. I got used to it and don't even think about whether I like it or not now.