Urgent help needed?

So there’s this girl I work with and she is frankly, amazing. Funny, beautiful, intelligent the whole package. She’s always smiling when we see each other at work (she only works two days a week), she seems to remember a lot about me too; for example I told her my birthday a month before or so and she kept reminding me how she remembers it and wrote me a birthday text. She laughs at pretty much all my jokes too and they suck! In terms of social media interactions they’re okay... she tends to pop up a lot usually at least once a day but yesterday we didn’t speak and today she texted me but was kinda blunt and I’m not sure why, because when we last spoke the day before yesterday, we had a great conversation and she was keeping it going etc. she initiates conversation too but it’s rarely a long detailed conversation, usually lasts 20mins to an hour(typical starts with her sending me a meme). Something weird is that she’s always one of the first to view my Snapchat story or at least first 5. She maintain eye contact a lot. I’m also a little older than her by 6 years is that weird? All your help would be appreciated. Recently I opened up to her and she sort of started to ask me for advice regarding a situation she’s in with her friend, so I feel like she’s beginning to trust me a little more.

What should I do, she said she wants to go out for drinks after her exams but I’m sure that’s with a group of people.