i don't think so. you were stamped in,she was just a tad suspicious cos thats a lot of time on tourist visas + extensions ( doesn't 180 days = tax resident?). the return air ticket query may have been to gauge if a further extension will be sought. i am also a retired long term visitor but keeping below 180 days per year. whether you are breaking any rules or not is somewhat unclear to me as IO rules and regulations are often applied inconsistently. your next tourist entry might be interesting. good luck.