SUISSE DO MISS CALLAN

Erin Callan, once Wall Street’s highest-ranking woman, has gone into personal seclusion after being summoned by a federal grand jury for a tell-all about the stunning collapse of Lehman Brothers.

Callan, who joined Credit Suisse five months ago after being ousted as CFO of collapsed investment bank Lehman Brothers, is taking a five-month personal leave from the Swiss bank, where she had been responsible for keeping the top hedge-fund clients happy.

At Lehman, Callan had been an admired public face of Lehman’s whirlwind dance with hedge fund chiefs, but then-CEO Dick Fuld blamed her for Lehman’s collapse, and pushed her out just months before the firm imploded, wiping out billions for investors and employees.

She and 24 other Lehman execs were subpoenaed by the feds.