What do you think about my action of telling my roommate to be more quiet and stop having people over for the night
Why don't you want your roommate to have people over?
She and her friends were so noisy and I had to suffer sound pollution until morning.
I can see how frustrating that must be when you are trying to sleep. It wouldn't be right to tell your roommate that they can't have company, but you could maybe talk to your roommate about keeping it down. You could also try hanging out with them which might be fun.
Well, since this is happening so often, I will make a big deal about it and make sure the landlord get involved.
Roommates have the right to have guests, so it's probably best to talk to your roommate first before bringing it up with the landlord.