Neither Labour nor even this MP has issued a threat. She tweeted:
> The Queen should look at what happened to her cousin Tino ex King of Greece when you enable a right wing coup! Monarchy abolished!
An abridged version of "what happened" is as follows:
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https://en.wikipedia.org/wiki/Constantine_II_of_Greece
Constantine II reigned as the King of Greece, from 1964 until the abolition of the monarchy in 1973.
He acceded as king following the death of his father King Paul in March 1964. Later that year he married Princess Anne-Marie of Denmark with whom he eventually had five children. Although the accession of the young monarch was initially regarded auspiciously, his reign soon became controversial: Constantine's involvement in the Apostasia of July 1965 created unrest among sections of the population and aggravated the ongoing political instability that culminated in the Colonels' Coup of 21 April 1967.
The coup was successful, leaving Constantine, as the head of state, little room to manoeuvre since he had no loyal military forces on which to rely. As a result, he reluctantly agreed to inaugurate the Greek military junta of 1967–1974 on the condition that it be made up largely of civilian ministers. On 13 December 1967, Constantine was forced to flee the country, following an unsuccessful countercoup against the junta. He remained (formally) the head of state in exile until the junta conducted the 1 June 1973 Greek republic referendum which abolished the monarchy.
This abolition was confirmed after the fall of the junta by the 1974 Greek republic referendum on 8 December, which established the Third Hellenic Republic.