Does this woman have bad etiquette or am I just insensitive?

Maybe she is unaware of the senior cles your gym has to offer...if she knows about it and still is attending the cl you both share then she is paying her do's and can attend when and how she likes...just as you are...Im sure these cles are repetitive and its not like you dont know the moves so maybe you needs to stop being so uptight and lighten up a little...