SPOKANE, Wash. -

A woman accused of killing her mother entered a not guilty plea in court Wednesday afternoon.

Rachael Colby is facing a second degree murder charge for the killing of her mother LaTanya Chapin, who was murdered in February.

Her body discovered late last month in the trunk of a car parked in east central Spokane and investigators say Colby and her boyfriend Juan Sifuentez beat Chapin to death with a baseball bat.

In court Colby appeared calm when she entered a not guilty plea to second degree murder. According to court documents Colby, 29, admitted to detectives that she helped her boyfriend cover up the death. Court documents show that she said she helped load her mother's body in the car after her boyfriend beat her to death with a bat.

She also admitted to detectives that she drove the car with her mother's body inside to a witness's house and then brought it to the place where detectives found it.

Colby was initially charged with rendering criminal assistance by hiding evidence but that charge was changed to second degree murder.

In court she old spoke two sentences, giving her name, birthday and her not guilty plea.

She will appear in court again on June 13 for a pre-trial conference. Her trial is set for June 30. Colby remains in custody, being held on a $500,000 bond.

Meanwhile her boyfriend Juan Sifuentez, also charged with second degree murder, is being held on a $750,000 bond.