It could be as simple as taking time to transition, but could also indicate issues with hearing or a receptive language delay. The things that immediately came to mind as concerning were: the spacing out behaviour/inability to follow directions/inappropriate responses to questions, or her random utterances not related to the topic at hand. Does she make eye contact or carry on reciprocal conversations with peers? Any repetitive behaviours/OCD/facial expressions that don't match the situation? Does she role play appropriately with toys? My gut instinct says to be on alert for anything along the ASD lines. Definitely do the Nipissing screening, and the Ages and Stages questionnaire is more specific as well.