A Chicago woman who contends she made an “uninformed decision” when she agreed to let a federal magistrate judge preside over her slip-and-fall case is stuck with her choice.In a written opinion this week, U.S. Magistrate Judge Young B. Kim denied Christine Brama’s motion to withdraw her consent for him to exercise jurisdiction over her lawsuit against Target Corp.A party in a civil case may withdraw consent to proceed before a magistrate judge only in the event of “extraordinary circumstances …