
I would suggest you get her meeting more dogs, more often!
One of mine was similar because he was so excited at seeing more of his own species, even though he lives with other dogs. If your schnauzer is your only dog she is bound to be either thrilled or a little anxious at seeing others of her kind, so you need to try to make them less of a novelty, and the best way to do this is to meet them so often they become commonplace and boring.
:)