Tahani, now 27, filled almost 500 pages with her experiences and those of her family and friends, as well as her hopes and dreams for the time when IS would be defeated.
"Just before our neighbourhood was liberated, IS began to harass people and force their way into their homes to carry out searches. One day I took out those hand-written pages and started to reread them, and I was shocked," she said.
"I realised that the content could put my life and my family at risk, as well as people I had mentioned in my diary. So I had no choice but to destroy those papers.
"I sat down, and started to burn one page at a time. Later, I blamed myself for not hiding my diary or burying it in our garden."
Although the diary is gone, Tahani remembers every word of the plans she made. Now IS has been defeated, Tahani is throwing herself into putting them in place.