Dear Bluetoria
Sorry for my tardiness in replying to your question - I promise it is not because I am in influenced by the fact that you live five minutes from Lord Darnley's former home.
As you probably know, Mary was a 22 year old widow with no close family when she was presented with Lord Darnley as a suitor. She recalled her first encounter with him - he was the 'lustiest and best proprotionit lang man'. She was ripe for love and didn't look beyond his 'manly charms' to see the 18 year old, selfish, debauched, womaniser he already was.
Soon she realised her mistake and distanced him. The vain, vapid young man, King Henry, as he had become accustomed to signing himself, responded by gathering around him every disaffected crony he could find who bore grudges against his wife, the 'Catholic' Queen.
On the night Darnley and his accomplices broke into the Queen's supper and murdered Riccio, her Italian secretary, not just before her eyes - the terrified man clung to her skirts for protection - he died, pleading with her 'sauvez ma vie, madame sauvez ma vie'. In order to, falsely, fully implicate him, Darnley's blood-covered dagger was found at the scene.
Mary believed that night, and, for the rest of her life, that her husband, Lord Darnley had planned that they murder her too.
Later, when Henry Darnley was murdered, she neither knew of nor was involved in the plot. She was aghast when she was wakened in the middle of the night and told of his death. Shocked, she immediately ordered the Court into mourning. A show trial was was instituted which resulted in James Bothwell, the accused, being acquitted.
In conclusion, I do not think Mary was involved in the murder of her husband. Naturally she was shocked to learn he was dead, but I cannot imagine she was terribly sorry to be rid of him.
tsaria
(makes the antics of the British Royal Family look tame)