[If Katniss hasn't talked about her, then Effie will have to explain this.]

I'm her Chaperone. She's the champion from District Twelve. It's...not a very nice district.

[There. The other hand gets a squirt of cream and she hurriedly fumbles the tube back Clint's way.]

My position as Chaperone is to prepare her; help make her ready for the....

For the Hunger Games. [She goes on quickly:] Bring her to appointments, monitor her manners, feed her, acquaint her with people she should know, make people like her...