I too am sorry that your mother is so negative. Isn't it so much better to finish your lovely quilts (and they are lovely) and use them or gift them than to collect the unfinished tops in a closet? There is absolutely nothing wrong with tying or using the self binding. This is YOUR QUILT to be done your way. Enjoy the process and don't give anyone the power over you to take away your joy. Many, many, many quilters do not have the money to send their quilts out to the so talented LAQ's. There is NO SHAME in that! Again, finish your projects and enjoy them. Do them YOUR WAY. Sorry your mom is like she is. Maybe you need to screen your calls when you don't feel able to deal with her. My neighbor has to do the same thing because her mother is so jealous of the daughter's successful life (has her Dr in Childhood Education and leading principal in our district-well loved and respected by all).
God Bless and enjoy your quilting, we are here for you!