The notes also said Chandler wiggled her body and head back and forth and asked her earlier to open her legs.
Prosecutors said they decided to try Vijayendran because her failure to report the incident had bad consequences. Another child reported experiencing similar behavior by Chandler about three months later.
Chandler is now facing charges of committing lewd and lascivious acts on five children. A crime lab allegedly found his semen on a classroom chair.
He has pleaded not guilty and is scheduled to go to trial Dec. 5.
Vijayendran has been reassigned to the district office as a coordinator of teacher support programs. In a statement, the Evergreen School District said jurors had a difficult decision to make, but it was disappointed with the outcome. The statement did not elaborate.
After Vijayendran was sentenced, juror Susan LaGaffa said the ex-principal "stuck her head in the sand rather than pull the alarm. I think she didn't want this ugly thing to be true."
Another juror, Christina Rodriguez said: "There's a lot more people to be blamed for this. She's a good person — we all saw that."