Several other people inside the home, including children, were not hurt.
"This incident could have easily been far more devastating," said Kent Police Detective Melanie Frazier.
Police responded to the scene, a residence in the 24500 block of 104th Avenue SE, shortly after 9 p.m. after receiving a report that a woman had been shot.
When patrol officers arrived they found the wounded woman inside the residence with a serious gunshot wound to the head. She was responsive and breathing at the time of their arrival.
Medics were able to stabilize her and she was rushed to the hospital. Her current condition was not immediately available.
Family friend Jessica Cabrales heard something was wrong, but didn't know what happened until she visited the home.
"It's sad, because I saw her as an aunt and I see them as cousins and I don't want her to die," Cabrales said.
Police said information about the shooting was limited. Investigators were able to establish that gunshots were fired into the home, which housed multiple people including children. The shooter or shooters fled the scene.
Police are not identifying the victim, but Cabrales said she has six children, who range in age from toddler to teenager.
The motive for the shooting at this time is unknown.
Anyone with information is asked to call Kent police at (253) 856-5808.