She got right up to the very rim and her door sill got dug into the bank. No doubt in my mind she could have pulled out, but it would have crushed her sill and maybe her door. So, she used the winch to pull one corner down to lift the sill. The winch pulled her all of 1.5-feet, and even then it was actually working against her rather than helping her. With sliders, she would have walked right out.
I say "walked right out", but it did take some time to get her though without damage. You can see in the pics how tight the squeeze was.