I have some quilts made by my great-grandmother and that it the kind of binding she did. I do the fold over kind sometimes too unless I want a contrasting color. The only advice I might have is that if you have enough extra of the backing fabric, fold it to double the thickness. Then it's just like if you were doing the add on binding! On another note...my grandmother was negative and critical like your mother...I just stayed away from her and her negative energy. And as several others have mentioned...she must be very insecure and unhappy herself to feel the need to treat others that way. Be happy, enjoy your hobby and be confident in whatever you make!