Oh, and doesn’t look like s/he was even braking. No apparent “diving” of Escalade front, distance between body and front tire looks same and driver seem not aware of situation until stopped by crash. Still holding phone and looking at it, rather than trying to stop, brace for crash with both hands on steering wheel.
Trailer would enlarge “diving” with its extra weight.
Because s/he wasn't. The Lexus just rear ended the car in front of her, that's why the shman hit the Lexus.