The 54-year-old was abducted on the morning of May 12. Her kidnappers reportedly demanded a ransom of several hundred thousand euros from her husband, Sparkasse banking chief in the Heidenheim region of Baden-Württemberg.
The huge police manhunt has been searching for the mother of two, but so far the authorities have found only her abandoned Mercedes A-Class car.
Following her family's emotional appeal on Wednesday evening on the unsolved crime show Aktenzeichen XY...ungelöst, about 100 calls came in, Heidenheim police spokesman Uli Stöckle told broadcaster ZDF on Thursday morning.
Most of the calls have centred on the location where her car was found and the location of the ransom exchange, he said.
Stöckle spoke of an "extremely difficult" investigation, explaining that the kidnappers have broken off contact, making their demands unclear and putting the health of the victim in question.
According to daily Bild last week, Mr. Bögerl spoke with his wife by phone shortly after her abduction and she told him the kidnapper or kidnappers were threatening to kill her.