CHICAGO (CBS) — Marilyn Hartman, the woman known as the “serial stowaway,” was beaten up inside the Cook County Jail this week, sources said.

Sources told CBS 2’s Brad Edwards that Hartman was assaulted on Tuesday. The offending inmate had some kind of episode – possibly a mental health issue, sources said.

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The inmate repeatedly struck Hartman and another inmate’s head against a number of hard surfaces.

The Cook County Sheriff’s office Hartman and the other detainee were evaluated by Cermak Hospital medical staff and no injuries were found.

Hartman was arrested for the eighth time this past fall for violating her probation.

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(Credit: Cook County Sheriff)

She was arrested at O’Hare International Airport, despite being prohibited from going to O’Hare or Midway international airports without a boarding pass, and was charged with criminal trespass.

She had been sentenced to 18 months’ probation back in March after attempting to board a plane from Chicago to London without a ticket.

She had also been arrested for trying to board planes without tickets several other times.

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The Cook County Sheriff’s office said since 2015, it has advocated for Hartman to receive treatment and stable housing in the community, and should not be in jail.