The thing is - there's no NEED for a fix in Dawn. The fix just exists (I think?) to change her posing to the same style of some other figures. Her posing/body parts are a feature, not a bug or a problem.

Dawn is rigged in a way to make sitting easier. Her "center" is the hip - but she also has a Pelvis body part, below the hip.

The problem you're seeing is probably because you just bent her hip with Inverse Kinematics on her feet, and that effectively bends her pelvis instead of her legs to keep her feet in place.

You can either 1. turn off IK, bend her hip, then bend each leg forward, or 2. leave IK on, bend her hip, then bend her Pelvis back to 0, and this is what happens (what you had / what it can be with my suggestion, with no extra fixes, out of the box as she loads from the content that comes with Poser 11.2):

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.