http://www.egafd.com/actresses/details.php/id/p0201
Pics at egafd (as a redhead) apparently come from "Blondi - Schwanzverrückt und Samengeil" which is the only film egafd have listed for her. The boxcover for "Scharfe Girls mit feuchten spalten" (1988) which I found posted in the 'Barbara' (CeeCee model) thread (Tina [16] @egafd) shows Petra with dark hair.