Pitre was born in Smooth Rock Falls, Ontario; her family moved to Montreal and then to Welland during her childhood.

[4] Other musicals she was involved with include Jacques Brel is Alive and Well and Living in Paris, I Love You, You're Perfect, Now Change, The World Goes 'Round, Blood Brothers, Tartuffe, Who's Afraid of Virginia Woolf?, The Roar of the Greasepaint - The Smell of the Crowd, Applause, and Rock 'n' Roll.

Pitre auditioned in New York City for the musical Napoleon being produced in London, but was turned down for the role of Josephine.

[7] Reviews were positive; Variety Magazine, although unenthusiastic about the musical, called her "a terrific Donna",[8] The New York Times called her performance "delightful" and praised her "terrific pop belter's voice",[9] and the San Francisco Chronicle praised her for making the show "a dramatic showstopper".

[19] On June 1, 2011, she performed a solo, self-produced, one-night, sold-out concert La Vie en Rouge at the St. Lawrence Centre for the Arts' Jane Mallett Theatre.

The French album, of the same name, was recorded live, off the floor, at Number 9 Audio Group in Toronto and released in conjunction with the concert.

[25] In 2016 Pitre performed in London, Ontario with Brendan Wall and Emm Gryner in The Grand Theatre production of Joni Mitchell: River.

[28] Other musical theatre performances include Pitre’s META’s (Montreal English Theatre Awards) nominated role of Edith Piaf in the 2018 North American premiere of The Angel & The Sparrow presented at the Segal Centre for Performing Arts in Montreal under the direction of Gordon Greenberg.

[32] In the fall of 2019, The Angel & The Sparrow was brought to Toronto by Mirvish Productions again under the direction of Gordon Greenberg and retitled Piaf/Dietrich, A Legendary Affair at which time Louise reprised her role as Edith Piaf opposite Jayne Lewis as Marlene Dietrich.