By Devan Coggan
September 27, 2015 at 09:13 PM EDT
Pascal Le Segretain/Getty Images

A few weeks after the death of best-selling author Jackie Collins, Joan Collins has written an emotional tribute to her sister.

In an essay posted on her website, Collins writes about the first time her sister told her that she had stage-four breast cancer — about seven years after she was first diagnosed. While Jackie initially told her daughters about her diagnosis, she didn’t speak publicly about the cancer. “That was typical of my sister,” Collins writes. “She always put other people, particularly family, ahead of herself.”

Although Collins says that the two occasionally drifted apart, they always reconnected, and she writes about everything from their teenage years to the glamorous last party Jackie threw.

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“I don’t think I will ever recover from the sadness of losing my beautiful baby sister,” Collins writes. “Someone once said, ‘The reality is that you don’t “get over” the loss of a loved one, you learn to live with it.’ I think Jackie would have liked us to do more than that. As she requested, I will not mourn her death, but rather celebrate her life. She will live on in the wonderful memories I have of her from our childhood and particularly from the last fifteen years, during which we were all closer than ever. I feel her spirit, I hear her wonderful laugh and I see her all the time in the hundreds of photos of her that are sprinkled around my home.”

“She wasn’t just a star — to me she was an entire galaxy,” Collins added.

Read Collins’ entire tribute to her sister here.