hey maneco,
Im from Brazil as well.
everything is gonna be ok. maybe you gonna have some "stress" because of that but im 100% sure you gonna get your greecard and your citizenship....
she probably is an angry mean person and probably got irritated with you "English".... I also live in Orlando and and I've encountered people being mean to me coz of my English....
but don't worry. they NOT gonna deny your case! Im a 100% sure!
by the way: I have a friend who went for a interview few weeks ago ( Brazilian guy in Orlando as well ) for the first green card, and the officer asked my friend a lot of crazy questions like "what is your wife favorite brands? ; where your wife does her hair and her nails? what is your wife dream????? he had no idea of the answers....and said "I don't know "....finally the officer got upset and asked "if I deny your green card, what you gonna do? are u taking your wife to Brazil?" my friend told me he was really upset at that moment and speechless. He said "I don't know how to answer your question, but I ll seek legal advice before I make any decision that will affect my family".....
they got approved same day few hour later