They had to with Karen's coke habit.
Now wait just a cotton pickin’ minute. That’s a ten yard penalty and a loss of down.
She was a “Superstar”
https://www.youtube.com/watch?v=EezQX8_QPRQ
Do you have a credible source for that? I searched and couldn’t find any article or source to back up such a claim.
Karen Carpenter died from heart failure, the result of the harm she did to her body having the disorder anorexia nervosa. In order to lose or not gain weight, she abused laxatives and thyroid replacement medication (to speed up her metabolism) and ipecac syrup (emetine), but I’ve never seen any mention of her using cocaine.
https://en.wikipedia.org/wiki/Karen_Carpenter#Cause_of_death