text: Only you know best what's good for you and her because you were her student. But if I were you, I would DEFINITELY go for it. I'm the kind of student (now a high school freshman) who has been blessed enough to have several teachers who have made a positive and significant difference in my life. And I told them about it, and it's just a great experience and relationship. You just can't have that kind of relationship with anyone other than a teacher, because, like any other relationship, all are difference. I would definitely do it. Don't feel embarassed. Write what you feel. Don't try to make it sound professional -- this is an old, favorite teacher of yours. If she really is a favorite, you should feel comfortable enough to feel like yourself around her. Trust me, I would do it -- teachers love getting that kind of thing, you'll feel better that you did it, and maybe you could make a difference in each other's lives. And if you're unsure of how to do it, it's like what my all-time favorite social studies teacher has been telling me lately, "Just do it."