The two women exchanged glances, then simultaneously asked the waiter:

"Isn’t the bill for Table 6 already paid?"

The waiter shook his head respectfully:

"Your friend left the restaurant without paying the bill, so…"

In most restaurants, unless it's specified that someone else is paying, the server assumes that the person who ordered the food will be responsible for the bill. So when Raegan and Ella left, the waiter didn't stop them ...