Why is Effie Trinket still with Peeta and Katniss?

Effie Trinket, along with Haymitch, is in charge of supervising Katniss and Peeta. She serves as an escort.

Apparently, Effie Trinket’s duties did not conclude at the station. She and Haymitch will be overseeing us right into the arena. In a way, that’s a plus because at least she can be counted on to corral us around to places on time whereas we haven’t seen Haymitch since he agreed to help us on the train. Probably passed out somewhere. Effie Trinket, on the other hand, seems to be flying high. We’re the first team she’s ever chaperoned that made a splash at the opening ceremonies.