Would never have thought that the surname Konestabo was Slovenian. In all my research have never encountered such a surname. However, there are quite a number of them in the Slovenian telephone directory. There are at least five such families in Pregarje at: # 84, #22, #10, #49 and #27. Pregarje belongs to the postal district: 6243 Obrov. It is not far from Ilirska Bistrica. If you were to write to the families, it is possible that one of them is related to your Ursula Konestabo.