I don't have Poser 4 installed ATM, but I'm pretty sure it's V4.2's JSM magnets that are causing the problems.

Solution:
Download a cr2 editor, load her cr2 file and delete all the embedded magnets.
Then try her again.

V4 works fine without the mags.

I in fact deleted the mags from both my standard as well as my LoRez version and use morphbrush fix morphs instead.
Saves a lot of memory and makes her bend a lot better than those pesky magnets.