An Ohio woman says a charter school is punishing her daughter for not immediately reporting that she saw two classmates having sex on a school bus and for changing her seat during the bus trip.

Saundra Roundtree told The Associated Press on Monday that her 14-year-old daughter had changed seats with a boy who wanted to sit beside a girl on a Dayton View Academy school trip.

Roundtree says her daughter told her at home afterward that she later saw the two having sex but was afraid to say anything.

Roundtree notified school officials. She says they told her Friday that her daughter cannot attend the eighth-grade prom or picnic. The mother thinks that's unfair.

The school did not immediately return calls Monday.

Dayton's WHIO-TV reports the two other students were suspended.