Make the quilt with whatever fabrics you have; whatever fabrics the MIL suggests; and eat the cost however you may. There will come a day when you are 75-80 and these women (whether a B----- or absent of mind) have passed and you will look back at the 20 to 30 hours devoted to make this moment of happiness by simply quilting was well worth the effort. Good luck and remember God blesses you with this ability to sew not only for ill children at summer camp (mentioned in your profile) but also for an elderly senile woman and her daughter (your MIL) whose life may not have been the most pleasant before you married her son. Life changes people. I have been in your shoes. Now a hint for the nursing home, quilt that label with grandmother's name within the quilt. It takes a lot of time to get identification off a quilt if label is also quilted.