'Way over the line' ... The back of the T-shirt the Florida school student was allegedly forced to wear by her mother, Melany Joyce Alexander, 31. Credit:The Washington Post

The Florida Department of Children and Families is also investigating the case involving the mother and her child, who is currently in the care of a stepfather, an agency spokesperson said.

After the child arrived at school with the markings and wearing the shirt, a school resource officer was notified and the child was given something else to wear, police said. "The injuries were severe enough that there was bruising the next day. That's severe," Moloney said. "Wanting your child to have good grades is great, but physical violence is no way to obtain that goal. There are other ways to coach your children."

The front of the shirt read: "My name is [redacted]. I currently have all F's in all of my classes. I am not aloud to have a boyfriend no time soon. So back off before I get another good woopin like I got last night. Also I can no longer have any friends until all of my F's are all brought up to C's and up!!!"

The back of it reads: "So unless you are helping me with this goal … back off!!! My eating French fries and being a social butterfly is over because I know why my parents send me to school. I now know the IMPORTANCE of my education. I will learn. I will listen to my teachers and be respectful, at all times. I will do these things because I am failing [redacted] due to my social life. Want to be my friend : ) Help me by not!!!"