Acquired on Tuesday, Jamaican forward plays 28 minutes on Wednesday at RFK Stadium.
Before D.C.'s 2-1 win at home, the attacking midfield crafted a plan of attack after watching film of his opponent.
Patrick Nyarko's 60th-minute strike and a fingertip save by the goalkeeper help DCU end four-game winless streak at home.
Jamaican forward scored 10 goals in each of first two pro seasons with Colorado Rapids.
Entering a match with Atlanta United, D.C. has gone scoreless in three consecutive MLS matches, in six of the past seven and 10 of 15 overall.
She led the team with five goals last season before signing with Valencia in Spain.
Sierra Leone forward has appeared in one MLS match this season after a promising debut last year.
After much-needed results in a pair of qualifiers, a reworked men's national team roster will prepare to host the CONCACAF tournament next month.
United goes scoreless for the sixth time in seven matches and 10th overall with shutout loss in Toronto.
Four days after dodging an upset by amateurs, D.C. will be the underdog against MLS's deep-pocketed leaders.