It's strange she is even talking numerology, especially about the number 7.
Please watch this video first to understand what Christine Lagarde talks about -- basically she predicts some major event to occur at around 7/20/2014.
Using similar numerology we can get the following from the downed Malaysian flight.
The aircraft type was Boeing 777
It crashed on 7/17/14 (14=7+7)
The maiden flight of the crashed aircraft occurred on 7/17/97 (97=9+7=16)-(1+6 =7)
7/17/97 to 7/17/14: The aircraft had 17 years in service
The uploader of the video predicts 7/20 although that is his extrapolation of the g7 and g20 hints given. He may be wrong. However, keep in might the crash occurred at 7/17 and now as the institutions write up their response, the main stream media jump on board, perhaps in a few days on 7/20 we will see something major go down. Perhaps this could be the precursor to WW3 or something else. Source