I am the one who said that lexy the shark could be hidden in night 3, 4 and 5 however there might be a special trick to unlock her and so far i haven't fond it (yet) but i will try again tonight maybe i might get lucky.
Oh and i don't think she hidden in night 6 but the possibility is there i am not ruling that out as i mention before there could be a special trick to unlock her also don't worry about your English my friend it not that bad ;).