She texts me, I respond, she reads my message but doesn't respond untill later?

MisterJohnson
So what is this, there is this girl I kinda like but I'm getting a bit annoyed by the way she is acting.. she messages me, I message her back within like +/- 15 mins and then she reads my message like 3 minutes later, continues to come online and offline and then responds a hour later? I'm so close to just ignoring her and be done with it because I get annoyed by things like this.. Why do girls do this? Do they do this on purpose? I mean if you don't want to talk to me then just don't talk to me at all.. right?
Updates
+1 y
With "She comes online and offline" I mean on whatsapp.. so she is on the app but just doesn't respond
She texts me, I respond, she reads my message but doesn't respond untill later?
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