Looks like she taught it as island strum, but performed it with a slightly different strum pattern:
Bar 11: 1 (&) 2 (&) (3) & 4 &
Bar 12: (1) & 2 & (3) & 4 (&)
For things like this, I’d recommend gaining an understanding of the rhythmic notation. If you’re able to read the rhythms above the tab, you’ll know exactly what to play. The best way to learn how to do this is by learning to read music.
After that, you can apply this rule of thumb: strum up on the up beat and down on the down beat.