Automation Will not send when triggered


My coworker set up an automation on their Smartsheet that stopped working for her a couple of days ago. When she triggers this automation it no longer emails to herself or the attendees or invitees. However, if I put my name in the meeting host field and trigger the automation it works. We are both licensed admin users in that workspace. Neither of us are the sheet owners on that particular sheet. What needs to change for it to work for her again?