Brooke travelled from Sydney to her home state Western Australia on compassionate grounds in order to grieve with her family. She had to complete two weeks of quarantine in line with COVID-19 rules.
The youth worker finished her isolation period on Monday, but has now begun the heartbreaking process of planning her sister's funeral.
"Just going to be real with you all today because organising a f**king funeral is hard," she told her 236,000 Instagram followers through tears on Tuesday.
"If I’ve not already been on an emotional rollercoaster for the last ten weeks, on top of then organising your sister’s funeral, it’s f**ked.
"I’m probably like one trigger away from a f**king nervous breakdown, but we all good."
Brooke pointed out a stress rash that has broken out on her face due to anxiety, but said she has managed to find the "silver linings" to the devastating situation.
"My family fly in today which I’m really excited about. I’ll feel less alone in the process," she said.
"I also booked my psych appointment and booked my [COVID] vaccination. So there's positives I guess."
Brooke, a proud Noongar-Yamatji woman, shared the news of her loss a few weeks ago while filming the upcoming season of The Bachelorette in Sydney.
"I do like to think I live a very private life but I kinda felt like I wanted to share with you where I’m at,” she wrote on Instagram.
"On the 11/8 I had just received news that my sister passed away. I've been trying to process that on my own being stuck in a Sydney lockdown without my family, off-country and by myself.
"I’ve thankfully had huge support from production and friends working tirelessly to get me back into WA."
Two days after her sister passed away, Brooke was granted a G2G pass to travel to her native Western Australia so she could mourn with her family.
"I truly believe in life that when there comes good, comes bad. This felt like one of those moments, but I can’t believe the huge support I’ve had," she said.
"I feel, honestly, so grateful. I wouldn’t be coping if it wasn’t for production, my friends, my loved ones and (my dog) Cobar."