Is it ok for my mom to make me wear diapers?

Yes. I think it depends on what age you are, obviously I think that you are at least 13, so if you are 13 and have some issues with wetting your pants, I think its okay. If I were you, I would try to work it out with your mom and show her that you don't need them. If you really do need them then what I would do is ask your mom if you can wear a tampon or one of those pad things instead of wearing a diaper, because I know that wearing a diaper would be embarrassing.