If this question is true then that is so wrong of your mom to be doing that. Punishing you by making you wear diapers during the day when you don't need them for wetting the bed is not right.
Kids, teens and adults even wet the bed because they can't control their bladder. I used to wet the bed as a kid and was luckily never punished for it.
This can be considered abuse for them to be forcing you to wear diapers as punishment. No kid or anyone should ever be punished wetting the bed.