日本語 Japanese Ask Questions Thread 8

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日本の方からのご協力も大歓迎です

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Guys, I cannot completely grasp the meaning of 「ちょっ……あたし、定期！　ねえ！」 sentence.
Two friends are in hurry and they are tryig to catch the train. And 小学生 girl is saying this sentence, as far as I can guess by 定期 she is talking about her special ticket, then the other girl is saying something like "Children's fee! It's free in emergency!"「子供料金！　緊急時無料！」 or something like this, unfortunetely I cannot really understand what how are those two sentences connected, and I would really appreciate if you tell me about it.
小学生：「ちょっ……あたし、定期！　ねえ！」
高学性：「子供料金！　緊急時無料！」