So, if I'm understanding the heroine's motivations correctly, having lots of money and a spirit for adventure, and now coming into possession of an artifact that can give her god-like powers (when combined with a native man), she:
A. Firms up the boobies.
B. Gives the artifact to the guy to fix and repair his world, apparently having no more interest in god-like powers.
Now, I'm not criticizing the motivation, or the thought that using your powers as a fountain of youth wouldn't be the first thing I'd do, too, but why doesn't the story end with the heroine and the native walking -- arm over shoulder -- into the sunset, saying, Casablanca style, "With my brains and your sweaty pits, this is the beginning of a beautiful friendship"?
The heroine is adventurous, forward-thinking, and bold. Her story should be a tale that begins with sagging rump and ends with taut bod.