What does this lingering hand touch mean?

HotDogg
What does this lingering hand touch mean?
I was casually pointing out something on a menu, she then pointed out something on the menu at the same time. As she did, she moved her hand right next to mine, touching side by side (seemingly deliberately). We both didn't move our hands away from each other, and we didn't say anything else. We just stayed there quietly, hands touching for a few moments. The only reason we moved our hands and continued conversation is because another friend started talking.

She's also subtly touched my fingers fairly often, like when I hand something to her or hold the door open for her. I do not think it's accidental, but those touches can be seen as such in case I don't like her back. Do you think she's showing interest in me?
What does this lingering hand touch mean?
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