I don't have 17, but in 18, she's a magical girl, and she doesn't show up in 19.In 20, however, she gets sucked into Madoka's re-transforming space thingy and then finds and rides an obliviously blissful superman Kyoko to find the exit.
And just call me "Juno". I personally don't mind the suffixes (I have to use them here, so it doesn't feel awkward to me like it would most people), but you don't live in Japan and, really, "-san" is unnecessary because it's a default identifier—something English speakers don't use. If you like suffixes, stick to using something like "-sensei" when referring to professionals of high respect, like manga artists, or "-chan/-kun" only between close friends who don't mind it. If you want to show me or someone else respect, simply act kind and respectful with your words and actions. Don't overdo it, of course. A simple "Thank you!" is all I need to know my work is appreciated.