Search and rescue teams responded to the scene, east of Granite Falls, after receiving an alert from a beacon at about 7:45 a.m. Saturday, said Lt. R. C. Rochon of the Snohomish County Sheriff's Office.
Rescuers confirmed the alert and learned that the woman was suffering a diabetic emergency while at Island Lake.
With the coordinates provided by the emergency beacon, a SnoHawk 10 helicopter crew was able to locate the victim quickly on a small island in Island Lake.
The woman was hoisted aboard the chopper and taken to the Verlot ranger station, where she received additional treatment and transport to a local hospital by medics.
At last report, the woman was in stable condition and expected to make a full recovery.