I've worked before in a fastfood chain way back college days. Before doing the actual work, we have to undergo several trainings and part of the training is familiarization of greetings and answers of the usual faq's of customers.
Babydoll, it could the staff utter the line that she has memorized from the training. We have to understand that they're being time "how fast they can serve a customer etc" though a little awful because her suggestions don't much what they're offering.
Not really ineptness, maybe she got tense or star struck when she saw you. Who knows?!