I have read everyone's advice on this subject. I agree with mostly everyone. If you go to the guild to learn, then continue doing it. But I also know how it is to feel uncomfortable being there wondering if this BM might be watching your every move. If it was me, and I wasn't comfortable being there expecting her to ridicule my work, I personally would not go. And when it comes to your work, not everyone will like it, but they don't count. I know what it feels like to get something finished and that finished product makes me proud. That is how you should feel. Everyone has their own tastes of fabric and designs. I have never been in a guild, but I did attend a "share a quilt" thing years ago. I didn't know some of the members but we did enjoy ourselves. Everyone didn't sew the same and there are parts of my quilt from then needs some repair work done on it, but that quilt has memories for me. I enjoy working with others though. I set up a night a week for relatives and friends to come to my house and we did a quilt together.......each had their own, but we did a simple design (because some didn't know how to sew). They all enjoyed themselves and looked forward to doing it. I helped when they needed it. We each did two quilts and then we stopped getting together (some had babies). I moved a distance away and now I am being bugged by them to organize something again. So you can have your own little gathering with friends and relatives and have an enjoyable experience with it. That is what I would do NOW (this time in my life).
BUT....if this lady says something to someone else about your quilt and it is loud enough for you to hear it, why not ask her (politely) what she thinks you are doing wrong. Or what she doesn't like about it. It might just be the colors. Like I said everyone has different tastes.
Barb