Danielle Vincent of Atlantic City had taken her nephew to the Franklin Institute on May 1, and at some point asked a young girl at a children's exhibit to stop splashing water, NJ.com reports.
That's when a man and two women -- one of whom was apparently the girl's mother -- began punching and pummeling Vincent, she told the media outlet.
The assault was caught on surveillance video and is under investigation by the Philadelphia Police Department.
The museum in a statement released to Daily Voice said:
"We are aware of the situation. We were in communication with the Philadelphia police on the day of the incident and have passed on to them all the details and information related to the situation."
Vincent says her doctor believes she suffered a concussion.
Click here for more from NJ.com.
Click here to follow Daily Voice Pascack Valley and receive free news updates.