When you end the texting conversation but she doesn't respond? Signs of worry?

rambo_92
Been on 2 dates with this girl and she's kept initiating after it everytime. This week has been hectic for her with assignments, interview, etc so she hasn't really initiated contact.

Before my birthday celebrations on Friday she told me she'd totally appreciate a drunk text if I sent one (she's sent 3 to me so far). So I sent a sweet one.

She replied Saturday morning with "Glad you had a good night and totally appreciated waking up to this text this morning :) smile on my face for today! Thank you xxx".

I didn't reply thinking I didn't need to, but then felt it was a bad idea not to..

So the next morning I text her "g'morning, thought i sent you a text back but I was hungover, but you're welcome :) Drunk or not I'd have sent that anyway x"

Girl - "Morning :) haha hungover [my name], I'd love to see that. Aww thanks :) working today? x"Me - "Oh would you now ;) Yeah I'm working then going out for a drink with a work mate after. You out with your girls tonight? x"
Girl - "Yeah I think you'd be a needy hungover person; wanting cuddles and a bed day! Oh nice, have a good day... yeah meeting up with them later today. Going to try and be sensible :P x"
Me - "If you're hinting for cuddles with me.. I don't come so easy! Haha you and the word sensible.. never :O Sounds great. I'll be returning to superhero duties soon x"
Girl - "You don't come so easy.. Right i'll remember that xD I know i'm going to try and be sensible, set myself a goal haha x"

An hour later I sent one saying "Haha, I'm going to have to focus on work. I'll see you at 7 outside [place] on Wednesday, we'll go to this little place I came across. Enjoy your night out x"

She hasn't replied to this which was 10 hours ago. She usually says "Okay see you" or something similar. The last time she went out to celebrate was on Thursday where she didn't reply to my conversation ending text, yet 3 hours later I got a drunk text.

Should I worry? Do girls usually not reply to conversation ending texts like this?
When you end the texting conversation but she doesn't respond? Signs of worry?
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