"I knew straight away what had happened," she said.
"It's only going to be a matter of time before someone gets killed. What if she'd hit the power pole?"
She said she had only owned the caravan a few months and recently had people staying in it.
Both women want the Whanganui District Council to put further safety measures in at the corner.
When Ms Watson's fence was last hit in October, council's senior roading engineer Rui Leitao said an investigation into the history of crashes on and approaching the intersection would be undertaken.
Mr Leitao said there were large chevron markers which were clearly visible when approaching the intersection.
"We believe the problem can be addressed and we will be taking some action based on evidence," he said.
Prang blocks state highway lane
Meanwhile, one lane of Whanganui's Great North Rd was blocked on Monday afternoon when a vehicle driven by German tourists collided with another vehicle at the intersection of Victoria Ave at about 1.30pm.
Constable Stu Bourne said no one was injured in the crash.