i have to do a presentation being abigail

You have the easiest and probably most entertaining character to depict. Selfish, deceitful, slightly hysterical (with flare, because she's not actually hysterical) and manipulative. Take your two minutes and use it to convince the other girls of what they need to accomplish in order to take the heat off themselves. Put yourself in her shoes and use your own experiences in peer pressure to re-enact her what I'll call bullying of her peers.