First of all this is not a friend. A friend respects you and doesn't make you feel bad. A friend respects your feelings. Comments are only as harmless as you let them be. If they hurt you then they are not harmless. There is a better and more appropriate ways to express to someone that you want to look back. If it was about her teasing she should have said Wow I was really wrong back then by teasing you about your height; that was really hurtful. This person really has not grown up at all since high school. Their insecurity causes them to make fun of you. They are immature and have no regard for the feelings or others or may not be aware of the impact of her words. She gains security by targeting others. She reminds me of a bully only with words. Distance yourself. She refuses to grow up.
If this was helpful press accept. Sorry for the delay