Lattanzi's mother Newton-John on Tuesday postponed her upcoming US and Canadian tour after discovering she has breast cancer.
As the news about the singer's disease came out, Lattanzi, 31, was slammed for posting her "happy" pictures on her photo-video sharing app.
"Some woman commented that I couldn't post happy pictures of myself because of what my mother is going through. I am so sad and no one has any idea what I am going through," Lattanzi wrote in one of two final posts.
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