"They could smell the odor of an alcoholic beverage emanating from her," Richards said.
He said Vanderbosch entered the bedroom, locked the door and strapped the baby into his safety seat.
It was when she came out of the bedroom that the clash occurred, Richards said.
"They tried to prevent her [from leaving] and she hit the grandparents with the car seat," he said. "The grandparents said they were both hit by Jennifer swinging the car seat several times."
The child's grandfather managed to grab Vanderbosch while his wife wrested the car seat and baby boy away, Richards said. The grandmother then called 911, he said, as her husband held Vanderbosch down to the floor. A deputy arrived minutes later and arrested Vanderbosch on suspicion of felony child endangerment, Richards said. She was booked into county jail. At 2 p.m. Monday, Vanderbosch remained in custody. Her bail had been set at $25,000.
The report said Vanderbosch spent Easter Sunday with her boyfriend and his parents at their Prunedale home. She and her boyfriend were both drinking, Richards said, so her boyfriend's mother drove them to their own homes following a heated argument. Richards said Vanderbosch returned in the evening to get her child.