If a girl doesn't respond with a kiss on her text message? Also, good or bad signs?

Anonymous
Me and this girl have been flirting and that, she always tends to reply to my texts quickly and we always seem to put x's at the end.

Before the weekend, I sent her a playful text about wanting to talk to her but the dumb guard wouldn't let me into the zoo and wanting her to escape. She replied with "Oo oo ah ah ah" with a monkey face.

So I decided to not put x's on my replies as she didn't, wanting to match her interest level I guess.

After the weekend, I texted her saying "Busy today but tell me when you're free to do facetime x" and she replied "I'm working all week but should be free Friday".

I've noticed she's stopped putting x's on her texts whenever I do now, am I worrying over nothing here?

I always assumed if you're interested in someone, you sort of "copy" them or if you're not into someone that away, you'd not use them if you're the sort of person who usually does.

Simple case of over thinking? I asked her to do facetime at the weekend but she was busy with work and that we'd do that soon, so I asked today and she said she was busy with work this week (she did write that on someones wall on Facebook before I asked) and told me she should be free Friday.

(Probably sounds ridiculous)
Updates
+1 y
Truthfully, should I initiate contact with her or should I let her come to me if she suggested Friday?
If a girl doesn't respond with a kiss on her text message? Also, good or bad signs?
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