A 62-year-old woman who is accused of viciously stabbing her acquaintance inside the lobby of Columbia Law School Thursday is the mother of a student attending the prestigious school, police said.

The suspect was arrested after the incident and expected to be charged Friday in connection with the attack, which occurred just before 4 p.m. in the lobby of Jerome L. Greene Hall, at 435 West 116th St.

Police said the attacker got into an argument with the 62-year-old victim, whom she knew prior to the incident.

The dispute escalated to violence when the student’s mom allegedly pulled out a kitchen knife and repeatedly plunged it into the other woman’s body.

According to sources, the victim was knifed in the right breast, right thigh and right shoulder, and slashed across her neck and on her right hand.

The woman was taken to Mount Sinai Morningside Hospital in critical but stable condition, police said.

The alleged attacker was taken into custody at the scene, and police recovered the knife used in the stabbing.

The female suspect was later transported to Harlem Hospital to be treated for an unspecified condition, where she remained through the late afternoon. She has not been identified.

Investigators have not revealed what sparked the argument between the two women, or how they knew one another.

At the time of the stabbing, Columbia Law students were taking their final exams.

The entrance to the law school building near where the stabbing occurred was closed Thursday night, according to the college newspaper.

“There is no doubt that an incident like this—involving physical violence—is jarring and upsetting,” Law School Dean Gillian Lester wrote in an email to the law students and faculty obtained by the Spectator.

“I also want to extend our collective concern to the person injured, with the sincere hope that they will make a full and complete recovery.”