If you were happy with your original idea, go with it. You are entitled to march to your own drummer, make your own decisions (and mistakes). If you truly like her idea better you can incorporate some or all of it in this or another quilt. Try new ideas, do something different, be your own designer. I've made a lot of quilts and I'm here to tell you that if you make a boo boo, it's not the end of the world. Mistakes are the tuition we pay for learning something new or trying something different. Throw your failures in the scrap bag and move on. You are not obligated in any way to use any one else's ideas. If you don't want her opinion, don't ask, if she offers take it with a grain of salt, you still don't have to use her suggestions, they ar not rules. Quilting is YOUR hobby. You need to enjoy every minute of it.