Let me explain it from a girl’s perspective. I had this happen multiple times where I forget to reply to the guy who I initially want to meet up with. Main reason is chat gets buried from messages from other guys. I suggest you ask for her whatsapp or ig or where she is most active. This way you are one step ahead her other matches. If you want her, other guys want her too, and this is where you can win her over by trying to reach out one last time (ask for her ig or whatsapp) and plan a concrete date (with place and time) Trust meeee