i would just ignore it, she is obviously happy and excited you are pregant and is probably trying to be useful
in a way that she can. if anything, i have a few
in case the baby has a bad diaper rash, and since she is making so many, dont feel bad if you throw one away.
you could also find something that you would prefer her to make, since she is good at sewing and ask her to make the baby a quilt, or find some cute patterns that you would love to have for the baby.