Sorry, second thought of advice.
The worst thing you can do is sell yourself short! I had a friend that agreed to HAND BIND a 120"x120" quilt for $20!!! She would have given them a DEAL charging $100! She didn't know the person, so it took the "friend" element out of it. It's hard knowing what to charge a friend (if this woman is). If she is, explain that quilts are expensive and ask what she feels is reasonable and work from there until you're both happy. Regardless, deposits are non-negotiable!