How do you battle a group project leech?

I'm paired with someone on a pretty big project and she constantly messages me 'hey, can you do the x part on your own, a have y, z... (some lame excuses)' and stuff like that, and generally comes off as lazy, uninterested and unintelligent to say the least. She's such a chore that I work faster without her by my side, because then I don't have to explain the things she was already supposed to know from class.

I fucking despise groupwork because of this. It's almost never an equal game, but the credit is always graded equally. Before anyone asks, yes I was forced into working with her. And I will do the whole thing properly on by myself because I care about the subject, but what's the best method to shake her up a bit?