I love Allie Brosh's description of what depression is like (and why non-depressed people's "suggestions" suck). (Part One is all the way back here). Zinnia Jones' description is also good; and comparing it vs her dysphoria post might could help for distinguishing depression-per-se vs other things with similar presentations. In addition to dysphoria, there's also things like dysthymia, CFS, and just plain ol' exhaustion. From your brief description above, the anhedonia and listlessness sound more like exhaustion or dysthymia rather than (major)depression.

(I grew up with all three of major-depression, dysthymia, and dysphoria. So I could try offering some insight into disambiguating them, if desired. Also, "they" = she, fwiw.)