Risa

I just realized that it might be from Caretaker.

Everyone knows that Janeway had two hair styles. Up in a bun for the first few seasons, then cut short into a bob for the rest of the series.

But she actually had a different, more complicated hairstyle before voyager was sent to the Delta Quadrant. Something I didn't notice until rewatching the whole series a few years back.

After the shockwave, her hair is all screwed up and they actually make it a point to show her walking down a corridor while quickly fixing her hair into the simple bun that she would keep for the early seasons.

I think this screen is from when her perfectly-styled hair was still in disarray.

I could be wrong.