"The children (aged 13-20) have been incredibly supportive. "I promised them I would be completely honest about everything; I wanted them to understand that they could ask me any questions.
"I recently spoke to each of them individually about how they felt a year on, and how they had felt that weekend.
"They said: 'We take our cues from you, Mum. You seem to be doing all right with it, so we're doing all right with it'."
Mendelsohn wrote that her type of cancer is "slow growing", that it is "currently incurable", and how 60 per cent of those living with lymphomas live more than 10 years.
The 46-year-old said she has chosen to monitor her cancer through the "watch and wait" approach and will begin treatment, a combination of chemotherapy and immunotherapy, if and when her symptoms worsen.
She revealed how she has removed processed sugar from her diet and now exercises twice a week, admitting she ironically feels "much healthier".
Hoping to publicise her illness, she said she wants to encourage others to check for the tell-tale signs of the disease. These often include sudden weight loss, night sweats, lumps and bumps.
- PA, AAP