Well I'm no tea expert but mint tea is an awesome tea for this time of year. Plus I've heard that it has medicinal purposes. With like, muscle cramps. It's supposed to be soothing. Maybe a nice darker chocolate kind of treat would go nicely with this? (if your Mom likes chocolate)

Green and white tea also go well with a lot of stuff but tend to be for things that have stronger flavors, seeing as these teas don't cover up the taste so much (at least in my own opinion).