What should I do with this girl?

What was the last thing you said before she replied and what were you talking about? There could be lots of reasons why she hasn't replied. Maybe you or her said something or something happened. I don't know, it's hard to tell but a day is a long time and I know a day seems like a long time when you like someone. Also a day is nothing if you are busy but if she liked you then she would reply more often. I know this isn't what you want to hear. I could be wrong, I don't know everything with that amount of information. She could just be busy but I always say no ones too busy to send one text back, especially when they have their phone or are on social media. If she's been posting stories then most likely she is ignoring you and doesn't want to talk or is playing hard to get, some sort of game. If you said she doesn't reply that often then ask yourself if she likes you the way you like her. I don't know what the two of you talk about so it's hard to know if she does. I would just wait until she texts you, it depends on what you were talking about last, some texts don't require a reply back, if you like someone then of course you'd reply or make conversation about anything. If it was me I would either ask her straight or why she hasn't texted back, if she wants to talk or (talk anymore) I'd ask her what's up and if anythings wrong, I would personally think I did something wrong if we talked a lot then someone's texts got slower. I think if someone texts back fast then I try to as well. I don't like games and it's far too easy for people to do these days. If you like someone then why play games? It doesn't show you care and would make me think they are players or don't like me like that. if she doesn't reply as often as you do then I would move on if she isn't giving you clear signs or if you are friends then you would know. If she does give signs of liking you by what you talk about then you should just talk to her about this. I like honesty and prefer people just tell me how they feel and ask her why she doesn't reply that often. You know her better than I do.