I Hate My Cousin

so my mom has 2 sisters, 1 of them lives locally and visits often, the other lives several states away and has never visited. the out of state sister came over 4 the 1st time 2day along with the local sister, and my god, out of state's daughter aka my cousin is actually the worst in so many ways
4 context, shes 12, almost 13. so shes still pretty young. of course, its hard 2 tell that with all the makeup caked on her face. no joke, did not see her without it on at all. the girl could look 100% different without her makeup and i would have no clue about it
my cousin was also... like... wicked obsessed with her crotch? like she rubbed it against literally anything near her. like idk if she was even doing it consciously or not, but it threw me off alot
and then she started talking about everybody that she 'hooked up with'. she went into some details here, and stuff i wont repeat on this site. but... this wasnt what a 12 yo should be talking about! at all! and her mother was just giggling about all this! i really dont get how a girl who isnt even 13 yet can be this far off the deep end!
and im stuck with her tomorrow as well. and from what i can gather, it will just be me, her, and her mom while every1 else goes 2 a local church. i wish i could go out the church 4 1ce in my life 😖