Silver Grey

Can a dark brown haircolor go a silver-grey?
My friend wants to make her dark brown curly hair (red undertones) a silver-grey, like Meryl Streep in “The Devil Wears Prada.”
She is deathly afraid it turning orange-y.
What do we need to do (bleach, then dye?)
Where can we maybe find a silver hair dye?
Does she need to have it done by a professional?
Please help to make this girl’s dream come true!
Put a Frost on it it’ll be great. I did it in the eairly 90s and I’m a red head
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