What?! Your “NC” is seeing her multiple times per day but not saying a word?!
Why so much contact? My son is 12. My last contact with my XW was 4 days ago and my next will probably be in 3 days. More space = more detachment.
Why are you not being polite as you would with a store clerk when you see her? This could be as simple as, “Hi!” or “Bye!” Politeness = better coparenting when needed.