<span style="line-height: 20.8px;">Blythe Masters is walking a tightrope to her next career in high finance. </span><span style="line-height: 20.8px;">The 46-year-old finance whiz, once the most powerful woman on Wall Street, is in high-stakes negotiations with investors for a $35 million financing round at the technology startup she now heads that will value the company at $100 million.</span>