what does it mean when a girl pats/holds your shoulder when you're saying goodbye on first meeting? im libra, she's saggitarius.?

me and this girl have been talking alot on social media and we have common interests, getting to konw each other and stuff. Yesterday we got to meet each other and we talked for a bit here and there. it was good. i did feel bad because i learned she can get overwhelemed by being in company of alot of ppl making her feeel breathless as a result. regardless, she still talked to me until she had to walk outside for fresh air. later on in the night, we saw each other when we could and talked. at the end, her ride was leaving and i couldn't spend more time with her. so i said cya, theres alot of ppl in the room btw, and she said it was nice meeting me, she patted once then held my arm with her hand, her hold was soft if that matters, i smiled at her and said the same. i didn't touch her tho...we met for the first time yesterday. there's that. im curious of subtle non verbal cues that i can be aware that confirms where her interest in me lies.

she's really reserved for a saggi. and me too for a libra. i have noticed at odd times our common interests would have us noticing or doing similar things that matched, like she wore a hat with a zelda emblem on the front and i have a wallet with the zelda emblem on the front too. i saw her phone have a keyboard function and im buying mine that has it too. we never talked about types of phones we like. and we reach those results.