Hi there, this is a very nice thought. One thing to consider about the scissors, do her hands ever cause her pain when she's been doing lots of sewing cutting or anything for that matter? If that's the case the best scissors wouldn't been scissors at all but instead sheers. These have a spring inside that causes them to spring open thereby are much less fatigueing to use. Fiskars soft touch are recommended by the Arthritis Foundation and I have found them to be much more comfortable to use than scissors. These are less expensive than others listed but they do come with a lifetime warranty if anything goes wrong. The Fiskars line also has a small pair for clipping threads.
As for a sewing box, look for something bigger than she has, ideally something with internal compartments to hold things like needles, buttons, ect.