"I love, love, love Effie so much," Banks said, adding that she "cried [her] eyes out" as the series came to an end.
Fans of the Katniss' minder, the Capitol's fussiest citizen, can look forward to more Effie than was written into the final installment of Suzanne Collins' series.
"I got lucky," Banks said of her added story. "It was very flattering."
"The Hunger Games: Mockingjay - Part 1" hits theaters November 21.