Family are hoping they can make something special happen in her final days, Ms Veide said.
"She's a massive Fat Freddy's Drop fan and we put it out on Facebook last night asking if they could come and play to her ... even if it was just a singer and guitarist, that would be just the most perfect send off for her and she deserves it."
Ms Veide and other family members planned to attend the band's Dunsborough, Western Australia, concert with Ms Nicholson on Valentine's Day, but that would no longer happen.
Her sister's favourite songs were Roady and Blackbird, and she had loved the band since their earliest days, Ms Veide said.
"She's always had a crush on [vocalist] Dallas [Tamaira]."
Her sister could no longer talk, but they had told her about their bid to get her favourite band bedside.
And the new arrival to the family was also keeping their spirits up.
Ten-week-old Ryder, born nine weeks early following his mum's cancer diagnosis, was doing well, Ms Veide said.