There are various opinions on whether breast cancer survivors want pink items. I have seen responses on the board for and against. Some even object to being called a "survivor".
My really great wonderful inspiring friend is a breast cancer survivor and she is also a clothes designer. She became an ambassador for Susan G Komen. she goes to the breast cancer treatment center to encourage other women in their journey. She has produce several "Think Pink" fashion shows in which she designed all of the clothing in various colors of pink and has other survivors participate in modeling them. And someone gave her a pair of pink boxing gloves when she was first diagnosed that she cherishes and brings with her to the different events she hosts.
My SIL is suffering from Stage 4 ovarian cancer and still through all she is going through manages to try to encourage others. She has been given much pink stuff from coworkers (though pink is not the color for ovarian cancer) and she brings it home to share or use herself. I made my SIL a red minky backed comfort quilt with the topside in flannel of Joe Boxer teddy bears dressed in red flannel pj's. She loves her quilt.
I guess it really depends on the personality of the person you are making the quilt for. Have your son or yourself talk to her son and find out what she really likes. You certainly wouldn't want to make her something pink that she really wouldn't like. After all it is a comfort quilt so make something that she would find comforting getting as much information before hand as possible.