"Are you all right?" Sophia glanced over her shoulder and caught the eyes of one of the other servers. She then nodded at the tray and towards the kitchen, hoping he would get the message. Fortunately he did and the tray was heading back to the kitchen. She didn't know it was either the food or the drink, but she didn't want to take the risk. And the punch bowl she'd taken the drink from was obvious.
"There are seats in the corner. Do you need to sit down?" She was also asking whether the lady needed help sitting down. While asking she rearranged the punch bowls so the suspect was against the wall and there were two in front of it. She'd be back to make sure it went somewhere safe (unless they tried testing the food and found it was the problem).