Is she still interested if she takes 12 hours to text back?

I met a girl a month ago and we’ve went out about 4 times now. She always takes up to 12 hours to respond to texts but has always showed up to our scheduled dates on time. We also have slept together and she still takes this long to respond to texts and never really initiates text conversations. I’m just kind of confused because in person she seems really interested but over text it seems like she doesn’t care at all. Does this mean that she isn’t really interested or is a bad communicator? I know girls are always on their phones so I’m sure she sees the message pretty soon after it comes through. Any input is appreciated.
Is she still interested if she takes 12 hours to text back?
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