Help!

In a bit of a mess! I’ve started to fall for this girl I work with. She’s really hot, we get on really well, but she’s 25 and I doubt she’d be interested in me. We’ve gone for drinks after work together before, we message daily when we’re based in different buildings and I’m meant to be going to a party at hers for Halloween - the only person from work she invited. Also just found out she’s joining my department in a few weeks and she keeps talking about how it’d be fun working with me. Struggling to see the line between good friends and something more with her. I would love for it to be something more but don’t want to ruin the friendship. How do I figure this out? Or how do I at least get over her so I can just be her friend and be happy with it???