The only reason Sophie didn't jump-startle at the knock- normally that'd almost be enough on its own -is because her brain was in Serious Business Modes, wherein she had to not lose focus, or she risked screwing up a stitch and having to either start over, or abandon ship entirely.
She flicked her eyes up for a split second, before immediately going back to keeping them locked on every stitch. "Welcome back," she said. "Ivee's almost done, she's back in the kitchen."
Stitch stitch stitch. The sewing machine whirred, then slowed to a stop as she let up on the pedal. Finally, she looked up and gave the queen a big smile. "The first dress is almost done! Just one more sleeve to go, but the waist is cinched in, and I hemmed up the bottom an inch. I looked again at your measurements and realized that while this dress wouldn't drag on the ground, it would hang low enough to potentially trip you going upstairs. I didn't take off more than an inch, and it's still long enough to get the same effect you wanted, but it's less likely to get your neck broken when you go up and down the stairs in your house."