She probably meant the Monster energy drink!
As already mentioned by Dave W, that isn't how Hebrew numbers work. Hebrew numerals are additive. Thus to get the number six hundred and sixty-six you'd need to take the numeric values for 600+60+6. Also as Dave mentioned, there is no 600 as the highest value is 400, thus requiring combining 400+200 (which would be a tav+resh). As such to use Hebrew numerals to get 666 you have to write tav+resh+samekh+vav, which gets us: (400+200)+60+6 = 666.
And, yes, the number is six hundred and sixty-six, not six, six, six. The number John wrote about in the Apocalypse is six hundred and sixty-six, or in some manuscripts six hundred and sixteen. Because the number here isn't mystical or magical; John was intentionally being cryptic by using a numerical code instead of speaking the person's name directly as he says very explicitly that the number is a person's name.
"
This calls for wisdom: let anyone with understanding calculate the number of the beast, for it is the number of a person. Its number is six hundred sixty-six." - Revelation 13:18
The only person, in history, that fits the bill in which it is in anyway meaningful is Nero.
Numerically NERON KAISER gets us six hundred and sixty-six, while NERO KAISER gets us six hundred and sixteen.
NERON from Greek. NERO from Latin. Converting these into Hebrew numerals gets us:
NRWN QSR and NRW QSR respectively.
Nun = 50
Resh = 200
Vav = 6
Nun = 50
Qof = 100
Samekh = 60
Resh = 200
50+200+6+50+100+60+200 = 666
Remove the final Nun so that it is NRW QSR then simply subtract 50.
Nun = 50
Resh = 200
Vav = 6
Qof = 100
Samekh = 60
Resh = 200
50+200+6+100+60+200 = 616
Now this may not be what John had in mind, but it's the best explanation I've ever come across to make sense of the text and which doesn't go into long nutty theories and/or simply making things up altogether.
-CryptoLutheran