I'd guess that she and Julien have at least a passing acquaintanceship since she lives in the Castle and is similarly ranked. But I doubt she's made anything for him.

Her glass studio might be near enough to the new age shop to have run into Justin. Plus, if it's like most new age shops, it's probably a good place for her to buy basic cotton and linen tunics and such for working in.

Probably does not know Johnny unless Johnny has hit on her and been shut down, and unlike her PB, Nisha doesn't do music.

ETA: And yes, she and Elani are probably professional/friendly.