It is hard to say without seeing the pattern but I am guessing alot of this is strip piecing so maybe it might not be as hard as it looks. Definitely looks like there is some paper-piecing involved in some of the blocks too.
I agree with Candlequilter...looks like a win-win situation if you agree upon a price. Mostly you just need to charge an agreed upon amount for your time since she is providing the class fee, cost of fabric and paying to have it quilted! Wish someone would offer me a deal like that!!!