As one of millions of women who color their hair, I have to admit that the odor associated with most dyes is pretty strong. Even after a few washes I can still smell the difference in my hair. I can only imagine how strong it is for Penny. It seems to me your Mom is probably right in this instance. I would give it a couple days for her to get acquainted with your new smell. A few extra washes to help lessen that dye smell might not hurt either. Since you did it at home your hands probably smell different too, and that's most likely what she reacted to. Hope that eases your mind some.