A girl who was my girlfriend blocked me for no reason?

Kyle0a00
Basiclly I met this girl online and she lived in Manchester while I live in London and we are young (16) and we had been talking for two months already saying I love you to eachother etc and she genuinely had a passion for me, she used to compliment me, text me in the morning and then suddenly I realised she took 2 hours to reply which was strange for her and I looked on the chat and her name was her username (she blocked me) I looked on Instagram I was blocked on there too, I tried making alternate accounts to message her and she blocks them straight away, tried texting her nothing, I had literally done nothing wrong and the last chat we had went something like
Me:I'm so ill I have the flu
Her:Aw babe get better soon
Me:thanks babe
And that's where she blocked me, she didn't even read the thanks just completely disappeared, I just wanna know what made her block me and want me out her life so quick?
A girl who was my girlfriend blocked me for no reason?
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