I'm going to tell my mom to be more quiet in the morning
Why do you want your mom to be more quiet in the mornings?
I would like to be able to sleep in a little later.
Sleep is really important, and I understand wanting to have quiet to sleep. I guess it depends on what time you're talking about. After a certain time, you've got to expect other people to make some noise.
I don't want her to make noise before 9 am.
I think that's a reasonable request and you should tell her you would like to start sleeping in a little more.