What should change when our morning timer makes my daughter slower and more upset?

The timer beeped while my nine-year-old was pulling out her ponytail for the third time. I said, "We agreed you would be ready by now." She said, "I can't think when you keep telling me how many minutes are left."

We have been late twice this week. I drive her to school and then start my shift, so five extra minutes in the bathroom can mean explaining another late arrival at work. My partner suggested the timer after I complained that she didn't understand the time.

I also insist that she leaves with brushed hair, a clean collar and everything looking tidy. Yesterday she offered to wear a simple ponytail with some bumps in it. I redid it. That took four minutes and made her cry when I said we were now behind.

I need us out of the door at 7:35. I don't need a perfect hairstyle. What is a fair way to reset this routine when I've been telling her to hurry while also increasing the standard she has to meet?