We certainly know Marie looks up to Oscar because not only did she save her but she's a strong woman who not only never backs down from a fight but doesn't take shit from anyone? Do you think it's implied she may have romantic feeling for Oscar? I don't see why not because before being told Oscar is a woman she thought she was a man.
I don't think this is going to come up in the plot honestly. It may not even be implied again but it's certainly interesting.