Wow, so many great suggestions. If she paper pieces an "add a quarter" ruler. A box of Crayola ultra washable fine tip markers. Color filters for determining value
https://www.amazon.com/Color-Evaluat...04398699&psc=1
One of these for ease of oiling her new machine
https://www.amazon.com/Refillable-Ne.../dp/B004WWYL2K
I also use all manner of drafting tools. I would be lost without my compass and protractor and I also love my flexible curve ruler and stencil of circles in all different sizes. I use these tools mostly to draft out quilting designs so maybe save these tools for a few years down the road.
Not stocking stuffers but inexpensive items to put under the tree: quilting books, preferably ones with loads of patterns like these two:
https://www.amazon.com/Book-Scrap-Qu...f+scrap+quilts
https://www.amazon.com/Fabulous-Rota...40_&dpSrc=srch