Problem: Amanda Samuels owns 100,000 shares of common stock of Zion Corporation. Amanda appointed her sister Rachel Samuels as her proxy to vote her shares through an executed proxy appointment form that was emailed to Zion Corporation's inspector of election and received on January 15, 2018. The appointment form was executed by Amanda on January 15, 2018, was effective immediately, and did not specify a term for Rachel's appointment. Rachel Samuels attended Zion Corporation's annual shareholder meeting on December 20, 2018 and voted her sister's shares in favor of the re-election of six of the members of the board of directors and against the re-election of one of the members of the board of directors. Are there any potential issues with Rachel Samuels's proxy appointment and vote?