RATTLED KATE CALLS IT QUITS!

ANICKED Princess Kate is so disturbed by the recent brazen break-in at Windsor Castle, she's rethinking her commitment to her future role as queen—placing a new strain on her 13-year marriage with heir to the throne Prince William, courtiers confide.

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Princess Kate reportedly said the burglary shattered her sense of safety at Adelaide Cottage

Now, sources squeal furious William is demanding his papa, King Charles, spare no expense to protect cancer survivor Kate and the couple's young kids!

"The terrifying burglary jolted William's sense of security once again. But worse, it threw his wife, Princess Kate, into a total panic!" dishes a high-level palace insider.

"She's had a slow recovery from months of chemotherapy to return to her royal duties. But this frightening breach has set her back physically and shaken her resolve."