After newest update, mbp won't get passed white screen

Hello community of apple.
I am writing this for my sister, who recently is experiencing problems with her 2012 Macbook Pro.
She had told me that after downloading the latest update (itunes and safari), like normal, her laptop shut down. Upon rebooting, a dialogue menu appeared saying "Unable to perform update", so she pressed "Ok" Evidently, black writing appears on the white screen saying her laptop is in "Panic "Unable to find driver for this platform:/"ACPI/"." Below this, it says "Debugger called: (panic)"
She had told me that she had contatcted apple, and they redirected her to discussions.apple.com.
Hopefully one of you has experienced a simular problem...however when I installed the update on my own macbook, it had installed flawlessly? If I have missed any significant points, feel free to ask!
Thanks!

24 hours later the laptop still wont work.
Cant startup using an external harddrive either...

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