The English teacher first posted "If my daughter was...", I corrected her, as is my civic duty, since she teaches
people how to write/speak, then Speed Racer very snarkily insisted that the English teacher was correct. You are free, Speed Racer, to google "subjunctive mood" & edify yourself (& Ms. English teacher, if she needs verification).
For uncertainty, employ subjunctive mood; for conditions contrary to fact, employ subjunctive mood; when you have a wish, employ subjunctive mood. If I were
you, I'd do that!