Maelstromme, Thanks for that link. This morning I found this tutorial for how to use the ground plane as a mirror, and found that it works with any prop.
Link
I'm going to make an oval, hand-held mirror with props from the
Poser 4 primitives folder and cast Varinkas face on that, floating in the air in front of her. But I can certainly use that standing mirror for other projects. I should start looking around sharecg for other freebies.