Is she interested or was this just a gesture?

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Was at a friend's wedding last weekend - was talking to a friend of the bride a lot that evening.
Prior to this wedding I've only ever this girl once and we were not on name basis prior to this let alone even had a conversation.

Come departing the event, being nice I say goodbye to everyone I've spoke to at the evening, unintentionally, left this girl for last... Said goodbye and as I'm about to leave she steps forward, leans in around my cheek and hesitates then kisses my cheek.

I was taken aback by this to be honest - I'd only really kiss someone on the cheek I knew well. I wasn't expecting that at all and to be honest sort of just froze after it for a second, didn't mention it, said goodbye and left.

I've not long ago broken up with someone, so I wasn't actively thinking about hitting on this girl. I did notice her. I did enjoy our conversations prior to that and I did think she was gorgeous...

Am I looking into this kiss too much or was she trying to give a signal that she's interested?

If this cheek kiss didn't happen I'd not be thinking about her since at all... but since it did I really can't get her out of my mind.