The mother of a student who was suspended for violating her school system's dress code says the rules unfairly target religion, WRTV in Indianapolis reported.

Tracy Prochnow said Highland High School in Indiana suspended her daughter, Brittany Brown, on Monday because the junior wore a Christian-themed T-shirt.

Monday was the fourth time Brittany violated the code, which the city's school board implemented this year and requires students to wear khakis and polo shirts.

Prochnow said the school may be violating her daughter's rights, and she has asked the school board to change the code.

"I don't believe it matters what she's wearing -- whether it be a T-shirt and jeans or polo and khakis -- as to what she's going to learn," Prochnow told WRTV.

The front of Brittany's T-shirt features a cross and the words "This Shirt Is Illegal In 51 Countries." The back quotes the Bible's Romans 1:16: "I am not ashamed of the gospel because it is the power of God ... the salvation of everyone who believes."

"The school is basically saying I can't wear a shirt that talks about Jesus or Christ or God or any religious type of T-shirt because we have to wear a polo," Brittany said.

The school's principal, Mark Finger, said the dress code doesn't target religious beliefs.

"The policy states there are to be no logos or slogans on a shirt," Finger said.

A city council member, Ollie Dixon, said he would work to change the policy. It wasn't clear what changes he would favor.