Tallulah Willis is reflecting on her dad Bruce Willis' heartbreaking health battle.

Nearly four months after the actor's family shared his frontotemporal dementia diagnosis, his 29-year-old daughter detailed the emotional journey. In a personal essay for Vogue, Tallulah noted that though her dad's health update was confirmed earlier this year, she had "known that something was wrong for a long time."

"It started out with a kind of vague unresponsiveness," she explained in the piece published May 31, "which the family chalked up to Hollywood hearing loss."

Tallulah shared that she sometimes took this behavior personally, in part due to the Die Hard star—who also shares kids Rumer, 33, Scout, 30 with ex Demi Moore and is dad to Mabel, 10, and Evelyn, 8 with wife Emma Heming Willis—expanding his family. But she was also facing heath battles of her own.

"I admit that I have met Bruce's decline in recent years with a share of avoidance and denial that I'm not proud of," she continued. "The truth is that I was too sick myself to handle it."