The niece of BBC weatherman Bill Giles was due to be returned to Devon after walking out of a psychiatric hospital and failing to turn up at court.
Joanna Toner, 38, who suffers from a mental illness, was due to be sentenced on Friday at Tiverton, Devon, for harassing Mr Giles, 58, and his wife Maureen, who live at Chinnor, near Thame.
But she failed to appear after going missing and a warrant was issued for her arrest.
Toner was arrested in London on Friday after an incident at the Cenotaph in Whitehall, when paint was smeared on the memorial.
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