Chicken escaped fence. I can’t get her back. What do I do?

Hi. Im a pet sitter not used to chickens. Any help would be greatly appreciated

I am pet sitting for 4 chickens. While I was going into the coop, 1 hen escaped. They were contained in a fenced in area I coursed her with food but when I opened the coop door again the rooster escaped. Client would not answer phone so I called a friend who has chickens. Friend came and got rooster in but not hen. We realized theres a hole in fence. Hen escaped hole and would go in and out of fenced in area. After 2 hours neither of us were able to get hen in coop and she has escaped into yard. We live in New England so its still kinda cold.

Pet sitting client will not call as “its not a good time” (never pet sitting for her again). I have explained the situation and she says its ok to leave door open and the hen will go in at dusk. I also get the impression she doesn’t care about the chickens as she even said when she showed me what to do “don’t worry if they escape, they are just chickens”. I am scared if I leave door open, the 3 other chickens will escape too. What do I do? I know I can’t get the hen in by myself or with friend. I am not scheduled to return to this house until Friday after my regular job. The client comes home Saturday and she hasn’t answered my recent texts.