"You are right, she's clueless."
Worse, there is no way on this planet in any known language to help her understand.
Write down what you spend on fabrics for one quilt, then add on shopping time, planning time and time spent for making the quilt @ at least $15 an hour.
Write Dear SIL, at the top and Pam1966 at the bottom. Admire it for a few minutes.
Rip it up and trash it.
You'll feel better!
Jois