For the stash fabric, starching & pressing.
Careful with the rotary cutter.
Accurate cutting. There is more fudge factor in other types of sewing. 1/4 inch isn't as forgiving as 5/8 is.
Measure and mark the 1/4 inch on the sewing machine for her. Garment construction is different & we are taught to watch the markings on the plate to the right of the needle to maintain seam allowance. Quilters watch the foot (if they have a 1/4 inch foot) or make a 1/4 inch seam stopper in front of the foot.
Press to the dark. Another difference in garment construction is they normally press open or serge seams together.
The above list were the "culture shock" issues for me when I started quilting. I'm sure there were others but those were my big issues.