First: What kind of sewing does she do
Second: What is Santa's budget
Third: If there is a local shop that sells machines, look for a good used one
Fourth: If not Third then go back to First and Second but get new machine from shop that can provide service.
Mail order is ok (sometimes) but one needs local support. I got a very good older White machine recenty when I wanted to play Santa. Local dealer had lots of used machines It works great.