If you're gaining quilting knowledge and skills while you're in the guild then keep with it. Don't let some rude loudmouth with a misguided opinion get to you and ruin your experiance. As far as how to deal with her I can't offer any advice other than not to stoop down to her level. She's obviously lacking some class and has an abundance of thoughtlessness with the way she rudely criticised your work and you shouldn't have to lower yourself to that sort of level in order to deal with her. You said so yourself that you just started getting good at it and loving it...don't let anyone change that.