The woman had been a trouper in the old days of one-night stands.
And he there made those excellent verses of the trouper (quaere).
"That is because I am a trouper, and troupers live in their trunks," smiled Anne.
1890, "actor or performer in a troupe," agent noun from troupe. Transferred sense of "reliable, uncomplaining person" [OED] is attested by 1942, American English.