London, UK - Kate Middleton is reportedly not planning a return to the public eye until next year as the royal continues her battle against cancer.

Since confirming her diagnosis earlier this year, the Princess of Wales has withdrawn from the public eye and stepped from her duties as she concentrates on her recovery.

The 42-year-old is undergoing "preventative chemotherapy," according to the palace, but it remains unclear how long her treatment will take.

Friends of the mother-of-three have shared a new detail that suggests the future Queen will not be returning to royal duties anytime soon.

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"I am told that Kate's diary for this year is empty," a royal source told the Daily Beast: "There is nothing planned. She may not appear in public for the rest of the year."

According to the report, Kate is "surrounded" by her closest family and has isolated herself from any other contacts.

Notably, the outlet specified that she's with her "birth family" – adding further confusion to the much-speculated-upon situation.

In January, Kate underwent an abdominal operation and subsequently withdrew from the public eye.

At the time, the palace said that the wife of Prince William would not be taking on any royal engagements until Easter. Her continued disappearance sparked such rampant theories that the Princess of Wales herself revealed her diagnosis in March.

Amid Kate's absence, the royal family has suspended public engagements for the time being due to the upcoming special election – a practice that has become standard for the British royals.