I have a couple of good quilters. One is always backed up for months (she's already booked until the next year). The others can give me a turn around in a couple of weeks. The one who's backed up is an absolutely fabulous quilter and that's why she's so backed up. It's up to you whether you want to wait or try someone else. If you're not in a hurry, I'm betting she's an excellent quilter if she has that much business.
BTW, my quilter will put my name on her waiting list even if I haven't finished my quilt. If I know I'm going to have something for her, I call her in advance to get in line. Maybe your quilter will do that too. There's trust involved, of course, and I've always had my quilts to her before my name gets to the top of the list.