How can the distress caused by working in a mixed-gender environment be alleviated, despite adhering to Islamic dress, especially since going out to work was at the father's request?

If the father insists that his daughter works in his shop, then she must wear the complete hijab and avoid speaking with men except out of necessity, with modesty and dignity, without softening her speech, and avoiding the use of perfume. Complete hijab means covering the face and the entire body.