I Found My Daughter Laying In Her Bed With A

I found my daughter laying in her bed with a grocery bag over her face, not over head. She weighed a little under 100lbs. There was no secretion of any kind. No struggle, she looked peaceful, as she was in her regular sleeping position. Eyes were slightly open.Her skin and lips were clammy, as I tried to perform CPR. Her lungs gurgled. I couldn't save her. Autopsy showed BA level in blood to be .04, and in eye fluid at .078. , there was also a small amount of citalopram, which she took perscribed. Could she really have suffocated without a fight? I don't understand, as she was healthy young woman but underweight by about ten lbs. Thank you.