In the film, she plays Fantine, a struggling, sickly mother forced into prostitution in 1800s Paris.
She tells the December issue of Vogue that the part left her in a "state of deprivation, physical and emotional".
She said she felt overwhelmed, but Schulman was understanding and supportive.
The couple wed in September in California.
The bride wore a custom gown by Valentino, whom she collaborated with on the design.
Working with the designer was a memory she says she will "treasure forever".