Lisa then urged her followers to be kind to themselves and focus on the "sweet things" in life despite the ongoing pandemic.
Lisa's sister Jess shared her own heartbreaking Instagram Story that could be in reference to Colleen's illness.
The singer reposted a tile that read: "You really never know how long you have on this earth and with these people you have with you. Live it. Love it. Love them. There is really no time at all to wait. Please, do it today."
In honour of International Women's Day in March this year, Jess also spoke about her mum's extremely rare neurological condition that was misdiagnosed on numerous occasions.
"Only 1300 Australian’s have ever been diagnosed. There is no cure, no treatment, and little to no research, support or funding to do with this disease. It presents itself in the most cruel & debilitating symptoms, losing all motor and cognitive function over the course of a few years. I won’t begin to tell you here what that looks like. It’s absolute hell," she wrote at the time.
Jess added that due to the lack of research and information available, they've had to live through the experience with limited knowledge of the disease.