<human>: There is this woman [19/f] I've [22/m] known from the start of the year and have since become friends with her.

As we talked to each other, she became fun, outgoing and playful towards me but suddenly and abruptly, as in; within the last week and it was sudden, she has practically gone cold, acting distant; as if she's putting up her guard towards me. She blocked me on Instagram and is hiding herself away from me on Facebook so she doesn't show up in my online chat list.

As far as I know, I didn't do anything to offend her. I do somewhat like her for her humour, wit and kindness, but that can hardly be considered offensive and I have been holding off on her as I want to have a friendship with her first before deciding whether or not to ask her out. If we didn't like each other like that when it came down to it - we'd still have our friendship. I've flaired this as 'non-romantic' for that reason.

Outside of that, it was her birthday recently and I created a personalised card for her, and texted her to wish her a happy birthday that morning - this would understandably weird out someone when we don't talk very often; but we actually know quite a bit about each-other and she actually liked and thoroughly enjoyed this. I never constantly try to contact or interact her online or text her for no reason (we're lucky to talk online or text once a week or less, and even then it's only to confirm something that we've organised previously), never spent money on her, etc. The friendship is platonic even with my mild interest in her beyond that.

Give me the gist of the text in a nutshell
<bot>: Why would a female friend suddenly and abruptly have a change of attitude and become distant/cold towards a guy friend, and what can I do to reverse this?