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The mother of the 6-year-old girl who was paddled by a school principal is under investigation after police interrogated her kids.

The family's attorney, Brent Probinsky, tells TMZ, the little girl and 2 of her siblings -- plus a cousin who lives in the home -- were pulled out of class Tuesday by officials with the Florida Dept. of Family and Children Services (DFACS).

Probinsky tells TMZ the unidentified mother is under investigation for reports of child neglect at home.

This comes as the mother filed a lawsuit against the School District for the paddling incident.

Melissa Carter, principal of Central Elementary School in Clewiston, is accused of paddling the child for damaging a school computer.

According to TMZ, the children were asked if their mother is abusive in the home, to which the children said no. Probinsky says the investigators then told him they wanted to follow up with the mother to ask why she didn't step in and intervene during her daughter's paddling.

Apparently, investigators were acting on a tip about the mom allegedly being neglectful at home. TMZ claims "there doesn't appear to be any evidence of that."

Probinsky says it's an outrage that law enforcement is investigating the mom, when the real culprit's on camera in the paddling video.

As Probinsky previously explained -- there's a number of reasons the mom didn't step in ... for one, she's undocumented and was afraid of repercussions.

Probinsky claims the the mother didn't know what was happening when she recorded the paddling due to a language barrier. However, Carter and the school clerk are both fluent in Spanish.

The school district is also investigating the paddling incident. Corporal punishment is not allowed in the school district.