Pierre-Louis put the Canadians ahead 1-0 in the 63rd minute after Nichelle Prince of Ajax, Ont., fed her with a through ball on the counter-attack.
"I was definitely pleased with the effort," said coach Bryan Rosenfeld. "We were able to come away with a point against a tough opponent in Nigeria."
Nigeria hit the woodwork of Canada's goal four times in the match but finally drew even in the 81st minute when Chinwendu Ihezuo volleyed in a chest-high pass.
The Nigerians dominated play throughout the match, getting 27 shots compared to Canada's eight.
Canada committed 12 fouls to Nigeria's four and had no corner kicks or free kicks. Nigeria had 10 corners and four free kicks.
Canada plays Colombia on Tuesday as group play continues. Colombia leads the group with three points after beating Azerbaijan 4-0.Suggest a correction