I take my daughter for my doc appointments, she stays in the waiting area with the helper while I get the scan done/ chat with the doc. Honestly she doesn't sit still for 5 mins except for the time she watches videos on youtube in the computer they have in the waiting area. So taking your daughter in QM scanning room might not be an issue although the nurses might raise an eyebrow at that but keeping her calm while the scan is being done with the lights down might be. Why dont you leave her with a friend for a playdate?