Kösem Sultan manages to keep power

WI Kösem Sultan managed to keep power as de facto ruler of the Ottoman Empire? Let's put the POD in 1651, when she manages to successfully catch wind of the conspiracies of her daughter in law, Turhan Hadice, ahead of time and get her numerous janissary allies to murder the woman, thus prolonging Kösem's control of the country and her regency during the minority of her grandson, Mehmet IV. What would be the longterm ramifications of this?
 
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