MARION, Ohio (AP) _ A woman accused of fatally shooting her 26-year-old granddaughter after using a hidden key to enter her house has been ruled incompetent to stand trial.

A psychiatric evaluation determined that Gertrude Simpkins, 68, of LaRue, doesn't understand the charges against her and can't help in her defense, Marion County Common Pleas Judge William Finnegan ruled Monday.

The judge ordered Simpkins to spend up to a year in a Columbus hospital, with the goal that she will be rehabilitated for trial.

Simpkins has pleaded not guilty by reason of insanity to charges of aggravated murder, attempted murder, felonious assault and aggravated burglary.

Authorities allege Simpkins used the key to enter Amanda Corbin's house on Feb. 16, and then shot her with a .22-caliber rifle when she arrived home. When Corbin's husband came home, authorities say, Simpkins shot him in the back and fled.

Brian Corbin, 26, survived the attack and was able to call 911. Simpkins was arrested after crashing her car as sheriff's deputies chased her.