Mara toughs out disease on her own

"Perhaps we should find a place where you can rest.”
"Where we all can rest," Mara corrected, and her tone told Leia to back off, a reminder that Leia was intruding on a private place for Mara, a place she had explicitly instructed all of her friends, even her husband, not to go. This disease was Mara's fight alone, to Mara's thinking, a battle that had forced her to reconsider everything she thought about her life, past, present, and future, and everything she thought about death.
Leia held her stare for a moment longer, but replaced her own concerned expression with one of acceptance. Mara did not want to be coddled or cuddled. She was determined to live on in an existence that did not name her disease as the most pressing and important facet of her entire life, to live on as she had before, with the illness being relegated to the position of nuisance, and nothing more.
Of course, Leia understood it to be much more than that, an internal churning that required Mara to spend hours and tremendous Force enerey merelv holding it in check. But that was Mara's business.
-Star Wars: New Jedi Order: Vector Prime