"She was already drifting sideways when I saw her, her tail was verging onto my side of the road so I shot up the left hand side to avoid hitting her.
"By the time I got out of the car she had smashed into the tree."
She said she felt sorry for the driver because it was an accident and it could have happened to anyone.
"It was bad enough I had to get my car between a powerpole and fence to get out of her way," Lovell said.
Watson was still shaking as she spoke to the Wanganui Chronicle. She said she was glad the driver was okay because, if she had come in any faster she could have been killed.
"I can't believe something is still not being done about this, it's a real problem and it keeps happening - five times in less than a year."
Fire, ambulance and police were called to the scene. Police said they couldn't comment on crash at this stage.
Sandra Watson presents petition for a roundabout
1400 signatures for Whanganui roundabout on 'death trap'