WI Christina of Sweden becomes Queen of Naples in 1657?

In 1656, Christina former Queen of Sweden planned to become Queen of Naples. Her plans involved the help of French military. She had made an agreement with Cardinal Mazarin. However her plan was foiled by Marchese Gian Rinaldo Monaldechi, her master of the horse, who had betrayed Christina's plans in the autumn of 1657...
WI Christina's plan wasnt betrayed and she was indeed crowned Queen of Naples in 1657 under French protection? How is that altering History? Any thoughts?
 
French troops sent to Naples are French troops that can't be used in the Spanish Netherlands. Unless she can find popular support and/or an undefended realm the Franco-Spanish War will last longer.

Britannica says that she planned to leave the throne to a French prince after her death.
 
Even if the plans had been betrayed, if Christina hadn't had Gian Rinaldo (her horseman, the betrayer) murdered, the French still would have supported her. Maybe with their help, the plan could have been successful.
 
Spanish would have reacted badly... They wanted Naples and they wouldnt handed overthe Kingdom to French just like that...
 
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