The shirt showed pictures of an apparent fetus and said "ABORTION: growing... growing... gone."
Amador's attorneys say she was told the shirt was disruptive and that she needed to remove it.
The district agreed to pay $50,000 to settle Amador's lawsuit on Friday.
However, the school district did not admit any wrongdoing.
Amador's attorney says it's a victory for free speech in schools.
AP contributed to this report.