10/28/2014 10:51 EDT | Updated 12/28/2014 05:59 EST

Alanis Morissette accused of faking 'sick' after cancelling fundraiser appearance

Alanis Morissette fans are taking to Twitter over the singer's absence at an Ottawa fundraiser Monday, and a tweet that appears to show her participating in a different cause at the same time.

A message on Hope Live's website shows that the Canadian pop star pulled out of an "intimate and acoustic" benefit concert planned for Oct. 27 citing illness, with the Guess Who's Burton Cummings stepping in to replace her. But a message posted on Morissette's Twitter account the same day of the appearance seems to show her participating in an event for a different foundation.

- On mobile? See Alanis Morissette's tweet here.

"A great day of sous-chef-ing for The @AdrienShellyFDN. An honour to be a part of supporting this cause again this year," Morissette's tweet read.

It's not clear when the photos were taken, but Canadians wasted little time accusing the 40-year-old singer of playing hooky.

While some demanded an explanation for the alleged double booking, others jumped to her defence.

- On mobile? Read tweets here, here and here.

Morissette has partnered with The Adrienne Shelly Foundation​ on a number of occasions, but the not-for-profit organiztion for female filmmakers doesn't list any events involving the singer on Oct. 27. 

Morissette has yet to comment on the Twitter reaction.