hrm. i wouldnt have thought the cap alone would let enough oil spew out to cause engine damage, if leaving the cap off lets any oil come out in the first place (on my gsx, cap off, any rpm no oil escapes, Cobra havent tried). i could see if they left the filter on there loose or the drain plug, both have gravity and some pressures working against them.
not to mention she heard the noise, pulled over, saw the motor and oil, and continued to drive. you hear any engine noises you stop the motor then and there.
gotta be more to the story IMO.
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-Thomas-

1998 Eclipse GST Spyder - 14b turbo | 3" Catback | Evo8 BoV | 170fwhp if that
2003 Redfire Cobra - 448whp/435wtq - Sold