Solid mom sitting there, but that is no 9.0 earthquake. Maybe a 7.0.
I was in the 7.2 Northridge earthquake (4 miles from the epicenter) and I can tell you that seeing that video, not a lot fell off that table, etc. In the earthquake we were in, the fridgerator went down, televisions went down, the bedroom dresser went down.
I was in a 5.6 earthquake will in Costco, and it shook almost as much as it did there
But if I was that mom, I would be covering the child, not just sitting there waiting to see if something falls from the ceiling or from the sides.