I seem to remember a interview with Anne that said the footwear was a function of her foot size: the Sidi boots only came in male sizes, the smallest ones were hard to get and her feet were too small for the warrior battle boots, leaving her the only option of the dress boots.
This would make sense given Maren was much taller and probably managed to wear a small male boot with an extra pait of soxs, but I don't know what that says about Jane's feet
Don't know if running in motocross boots looked any easier or more comfortable than a cuban heel
(but I sure wanted to try...)
cheers
Lara