They can stay low before you leave the base and not show themselves until you pass through the gates.
You will be leaving at night anyway and no one will notice them in the dark.
Also, if the leaders are as greedy as you say, then it would never occur to them that you are escaping once they hear about the supplies." Leng Pan explained her plan in detail.
"You should leave that Cinderella behind. Tell her parents that she insisted on staying to guard the supplies.
Once your families are out, you can drop her near the base." Leng Pan added while pointing at the entitled princess who had been left out of the conversation.
"Great." The half-sister nearly celebrated. She didn't want to live with that family one more day.
"But you seem to be on a mission of your own, how will we get to your base?" The leader asked.
"We will wait for you here until you come back, then you can take a few of our teammates back to the base.
