Martha Gaskell (1881-1920) Cause of Death?

Trying to find the cause of death for Martha Gaskell (May 15, 1881 - Apr. 8, 1920). She was the daughter of Peter Gaskell and Ellen C F Blackmore. She married Robert Sharples (1878-1957) and they had 8 children. 2 of the children died very young and Robert married Martha Ann Foster (1888-1972) the year after Martha Gaskell's death. All of the family moved to Canada except for the eldest child, Sydney J Sharples (1900-1977). Martha died quite young (38) and I'm curious of her cause of death. I would immensely appreciate anyone who can help with information regarding her death, or if anyone has heard of any family stories leading up to her death.