Maria says "fuck you"+.
Gladly.
That doesn't make any sense.
(hypothetically) Maria told Leena, fuck you, Leena would take it as "I want to fuck you" to which she's saying "gladly"...
But, that is not what someone means when they say "Fuck you". I stand by my previous statement. I do not see how someone could take it as meaning "I want to fuck you".
Okay, listen up, you lunchboxes. If she said "fuck you," that's a command, in which the subject is an implied 'you.' Tack that to the beginning and it's "you fuck you," which means that it's a reflexive verb, and should be changed to "fuck yourself." So Maria told Leena to go perform an anatomically impossible act, and Leena obliged. That's icky. Class dismissed.