Without the Storm King controlling her, Tempest has complete control over his vast legions. With the full might of her grand army, she could easily subdue any resistance in her conquered Equestrian territory. Of course, her new regime would mean a definite shift in priorities. Once the princesses are deprived of their magic, there’s little reason to keep them as statues when they would be so much more useful as pets for their glorious leader.
 
They would only require a little training to know their place in the new order. Once they realise their true purpose is to serve their mistress, providing her with pleasure and amusement on demand, they should prove quite manageable.

@NotSoCleverMan  
A lifetime of sluts serving their mistress.
 
 
Two “loving” pets.

Better then petrification.  
Though partial petrification can be more interesting.