As a retired teacher, I can appreciate your wanting to give/make something the teacher will use & like. Ask around, either other teachers or parents, & find out if the teacher is a tea or coffee drinker. Rather than give another mug, how about a mug rug, cup snug(keeps hands from heat) and a selection or assortment of teas or coffee? I saw that you said there isn't a coffee place in your town, so having teas or coffee available would give her some choices to suit her mood. I saw a pattern for a cup snug that was on the All People Quilt site & it would use up scraps & snips of fabric. Add in your delicious homemade baked good & she'll be a happy teacher!