
"a virus flooded my laptop instantly corrupting all my files "
Every time I've had to deal with one of these ransomware nasties, the malware sat silently in the background happily encrypting everything without the users knowledge. Only once all accessible files have been encrypted does the user get the "we haz all your filez" pop-up which demands the ransom.
There's no way it could have instantly encrypted all of her documents immediately after opening the dodgy email....