2. Amy 'is' and 'participated' don't seem to fit. I think you should use 'participates' instead.
The clue is the Title of the thread, "For graduation".
What Amy did at school is now, well, nostalgia. Sounds like she has weeks to go, and this is for the Yearbook, or a job reference. It is describing her 'participation' whilst she was in high school, and when this sentence is read, those days will have gone - hence, the past tense "actively participated".