Regardless of whether your expectations are too high or hers are too low you seem to have gotten off to a rocky start with her. Unless you have seen her work and just absolutely have to have her do it I think I would ask for my quilt back and start over.
In regards to a reservation date, you need to treat this just like when you take your car in for service. You ask for the first date available and if you know that you will have your quilt ready and can have it to her by then accept it and then 2 week time frame you got starts from your Scheduled Date. In quilting you can't really say just pencil me in - what happens if I pencil you in for where your quilt would fall in my queue right now when you ask and that date is April 5th and you don't have to me by then. You have to be requeue'd, you can't expect that everything else would be moved around (unless you worked with her and she was ok with that) and then have yours go first in the list when you do get it to her. I don't understand how that would work because she could have 5 customers ask to be penciled in and then have them brought all at the same time and everyone expect to have their quilts back in 2 week.
I think that a lot of the people who are saying they have waited months, really aren't waiting months after the promised date. I can have an appointment/reservation for June 5th the first available date, but if I get it to her in March and get it back say June 19th - yes she has had my quilt for say 4 months BUT that was because I got it to her early so I could get it out of my house. In reality that june 19th delivery date is 2 weeks.
I know I am rambling but just think that some are misunderstanding how long you would have to leave your quilt at the LA.