There's a chick who works at the coffee place opposite my fire station. She keeps giggling when talking to me, asks me ' you drink that??' when I buy stuff out of the norm, commented on how my hands were so cold (from the fire station office) and had this gave me a high pitched byebye when I left

I know this might sound overly dumb/overly cautious but I feel like these may be IOIs?

My ex used to flagrantly show IOIs to everyone so I'm trying to be more cautious now when assessing them.

Idk if I should deliberately go to the coffee place with my colleague to test how hypergamously she shows off IOIs?

If they are IOIs, and I'm only into plating her, how do I frame the relationship?