Reid's a profiler, so he'd end up giving her the thing he thinks she'd really want, which would be the Magnezone plushie.

As for Reid, he's pretty hard to shop for. He'd be happy with a book, but he'd whiz right through it and never need to read it again, so it's not very sentimental. Something that seemed like it suits him instead of a generic genius would be nice. Oh, sudden idea: he has a thing for charms. He knows it's completely illogical, but he wears a bracelet that's meant to protect him, so maybe a small token that's either traditionally spiritual or personal to Twilight. He's nervous about his mental health, and little things like that soothe him no matter how little sense it makes.

There's also a theme this year of people giving him things new to try, like an ocarina and water colors, so she could always try to give him something like an instrument.