It wouldn't matter who Amelie practiced with, I think some people would assume they were an item. Which is small-minded in my opinion to think that any woman that is friends or associates with lesbians would be gay or vise-versa.
I have many straight and gay friends (male and female) that I have worked with through fund-raising for pediatric AIDS charities and food for the homeless. I don't care who they sleep with, but rather our common goal which is to help others who are less fortunate.
While I wish my boyfriend wouldn't smoke pot, I love him for the fact that I can bring anyone around him (straight, gay, singles, couples, etc) and he doesn't care either. Because at the end of the day, we are all human beings, regardless of who we love.