Rescue crews worked for nearly an hour Thursday morning to free an elderly woman who became trapped inside her car after it crashed into a tree in Hellam Township, police said.

Joanne Diller, 76, of Dillsburg,suffered minor injuries, Hellam Township Police Chief Mark Sowers said.

She was driving eastbound on Route 30 near the Accomac Road overpass about 9 a.m. when the crash happened, he said.

A witness driving behind Diller told officers Diller was driving normally, then started weaving a bit within her own lane, according to Sowers.

"She then left the road for an unknown reason, went down an embankment and struck a tree," he said.

Limb fell on car: Her car stopped in a ditch, and a tree limb fell on it, Sowers said.

A passer-by pulled the limb off the car, the chief said.

Fire and rescue crews from Hellam Township and Wrightsville were forced to cut the roof off Diller's car to free her, after which she was taken to the hospital by ambulance, according to Sowers.

As of 11:30 a.m., Diller was still being treated in York Hospital's emergency department, hospital spokesman Barry Sparks said.

No other vehicles were involved in the crash.

One eastbound lane of Route 30 was closed for a little less than an hour while crews rescued Diller and cleaned up the accident scene, Sowers said.

Because Diller's driving was "perfectly normal" before the crash, police are looking into the possibility a medical issue caused it, the chief confirmed.

— Reach Liz Evans Scolforo at levans@yorkdispatch.com.