She asks questions that aren't necessary

She already knows where you went on holiday — you posted about it. She already knows you have a sister because you mentioned her last week. She knows what you do for work because it came up in the first conversation. The questions she's asking aren't actually about information — they're about extending contact, about staying inside the conversation a little longer, about giving you a reason to keep talking. The content of the question is a pretext for the real agenda, which is more time with you. This is actually a sophisticated form of interest. She's not asking because she doesn't know. She's asking because asking gives her a reason to look at you while you answer, to react to what you say, to follow up with another question that keeps the thread alive. The unnecessary question is a small investment — low-risk, low-stakes — that says 'I want this conversation to continue.' Multiple unnecessary questions over an evening add up to a clear and consistent signal.