No because she would have to look at her reflection and her reflection can't turn anyone into stone.
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Yes. In Clash of the Titans (remake) Perseus cuts off the head but is still able to use it to stone the Kraken. And it also says that in my Greek Myth books.
Presumably, Yes, anything with eyes/sight can be turned to stone by Medusa's gaze. Though the curse originally pertained to Men, godly or mortal.
Medusa
You will turn into stone if Medusa wasnt looking at you but if st you he was looking at you, you will turn into an stone
Medusa could turn people into stone.
When someone looks at Medusa they turn in to stone.
Medusa was famous for being able to turn people or animals to stone.