You can find the answer pretty much anywhere, but.
No. She doesn’t.
They fight, “break up”, but with the school blaming Liam for it because news of the threesome gets out, Karma makes a public announcement to take blame and apologizes to Liam and Amy, who runs back and hugs her and everyone’s happy again, including Amy.
Then Karma says she thinks they should break up for real, then goes off to Liam who says he’s falling for her and they start making out and then clothes start coming off and it’s a fade out to what we can pretty much assume was to them having sex.