What is happening?

When I text my girlfriend on Whatsapp, it is left on a grey tick meaning it hasn't been sent, however, I know she hasn't blocked me as I can still see her profile pic. My girlfriend comes online on the platform occasionally and then my messages get delivered and read. After, when I try and text her say 30 mins later, its on one grey tick again for hours. This is a recurring thing. I dont think she is unblocking and blocking. What could be the reason this is happening?

I was thinking airplane mode, but why would you keep checking and unchecking that... strange...
What is happening?
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