whats a good prank to teach these girls a lesson?

[Rai-Rai]

My cousin has been getting made fun of in school and we want to play a prank on the three girls who have been ridiculing her please include as many ideas as you can and it has to be something she can do IN school where they won't know it was her. Thanks <3
they've been saying she wears too much makeup and it makes her look like a fake barbie doll and that she has a bald spot on her head (which she doesn't) stupid little insultive comments on the way she looks

[be happy!]

okay if you guys have lockers (some schools don't) then stuff a bunch (and i mean like hundreds) of love notes in one of the girls lockers.... and make it by a really cute guy that the one girl likes. And make it say that he likes her a lot and wants to go out with her so bad but she has to bring her friends to him and, in front of him, say they look like a bunch of retarded fools or something really mean and then he'd go out with her. Not only will it make her look like a fool but make her chances with him soo low and her friends will be over with her.
Or try this: Start a rumor about how they are gay or something and that the only reasons they're friends is cause they're girlfriends.
They might sound stupid but once you try it you'll see that it works.

[dpsklsd]

well you could just insult them back only think of more better insults than they can

[Bebop]

what have they been doing, the punishement should fit the crime.

Edit:
Invite them to a party, make sure the three of them are the only ones in their age group. All the other invitees should be atleast 2 grades beneath them. make sure to include the stupid games like pin the tail on the donkey and such.

Edit:
the best way by far to put somebody in their place is to make them feel like they're more mature than others, then show them they're not.

[Jien]

Spread rumors about them through email and stuff under an anonymous/their name. So it looks like they're the ones telling their own secret XD

[Jack]

Put some rat poison in they're juice boxes...that should shut them up.

[Manda]

Invite them to a party, make sure the three of them are the only ones in their age group. All the other invitees should be at least 2 grades beneath them. make sure to include the stupid games like pin the tail on the donkey and such.
or make this really big party and invite them and say we are out of cups will you go get some more all of you and make this big bu get of paint so when they open the door it will poor all over them or you can invite them to another party and say only to them it is a costume party and they will were costumes and no one else will and they will get humiliated