But at the same time think she hasn't handled the publication of the book very well? Which predates illness and death of her husband by years.
No it doesn't. Deborah states (emphasis mine):
Along my journey since working on re-publication of the book, I have endured the heartache of my husband’s declining health, and fight for his life. On May 11, 2017, my darling husband, Dan Dykstra lost his battle for his life and he died. He was not well for a very long time. The past two years of his life were especially hard.
Cynthia Franz died December 29th 2013.
Deborah's husband died in May 2017, and as per the above she says the previous 2 years were very hard. So that goes back to 2015. And before that he was also ill ('for a very long time').
So it's entirely possible that her husband was ill even when Cynthia died.
Let's hold off on comments like 'she hasn't handled the publication of the book very well.'