She’s comfortable with me, talks a lot, shares things, but I don’t think she’s interested

There’s this girl I work with. We’ve become pretty good friends — she talks to me a lot, shares things about her family, even little secrets, hangs out and is quite frank and open. Sometimes she texts me randomly too. She’s mature, responsible and knows what she’s doing.

She’s comfortable enough around me — joking, sharing rides, having long conversations — but deep down I don’t think she’s interested in me romantically. I don’t get that vibe. It’s like she trusts me and enjoys my company but there’s no ‘spark’ from her side.

I’m not expecting anything, just trying to understand — is this normal? Can someone be this close yet not have feelings? Or am I missing some signs?