Hi guys,
Been a while since I've had a cancellation so wanted some advice from the pros..
</skip cringing texts!>
What do I do now and what are your views? Don't want to come across as needy but asking her out again but I still want to keep her interested. I've noticed she's been online (her profile said she's online) so wasn't sure what to do. Should I text, I have a slot on Monday and we can meet then?
Recommendations guys. And yes, probably my texts were rubbish.
Wait, play it cool. You have a rapport with her, cringing as it may be to us outsiders, and she will not forget it easily.
The last text did unfortunately close off any agendaless convo for the entirety of the weekend, for future ref finish with something less definite, or shorter term, "hope you feel better soon, speak soon" or even, have a great evening.
With that in mind, it may be awkward to contact her again earlier than your signoff indicated, without obviously having a reason other than enjoying conversation with her. Regardless, if you do manage to, or better yet, she texts/contacts you, you can let her know about your window on monday without "letting her know"

Subtlety is key, so "what are you upto next week" or "what days are you free" are out the window

Try asking about work, any big projects, christmas party plans and other small talk, which should trigger an in-kind counter question, into which you can weave how you've been given monday afternoon off for reason XY etc etc, you see where I'm going, I hope
Bit of a ramble, but key points:
Be cool, you don't need to be the first contact for every conversation.
Be subtle
Good luck
