It's a testament to Odessa's sentiment that it's taken most of Benevenuta's day to day colleagues several days to realize that she isn't blonde any more and that that does mean she changed something. Given they do work in Emergency, it's not anything she's especially inclined to take personally, and it's hard to expect a minor style change to register when one of your other colleagues changes color with the weather temperature and pressure. Successfully inuring yourself against startling at that in surgery (or even registering it) tends to have a flow on effect.

--and it's not exactly her own highest priority, witness: "Is that a fresh pot?" Coffee is much more immediately important than aesthetics or even 'who it is she just asked about the coffee'.