Up to 0:05, the fingering shown on video matches the notes that are actually played. Sadly, though, her fingers go to the G# position (ring and middle fingers down, index finger up) too early, while she's supposed to be still playing an A (index and middle finger down, ring finger up)... Maybe the animator had her change position at that point because he heard a note change, there, but that's from the euphonium, not the trumpet.