It’s not 100% clear, but its implied that Kels was never abused by her father. Just Lol (and Trev) on the receiving end.
The caravan scene was to demonstrate Kel’s pathway to self destruction and disassociation with herself and her friends.
I have wondered why Kel is so completely unwilling to accept the accusations made against her father – but its a difficult dynamic to imagine.
Perhaps i’m completely wrong and she has merely been in complete denial, and subconsciously blames herself for being abused. But it’s not been portrayed openly on any series yet.