16 years ago whilst living in Germany I married my Thai girlfriend in Bangkok..Germany wanted a crazy amount of paperwork from my girlfriend/wife. Of course you should enquire at the German Embassy, although my experience was the opposite of NativeBob's; they were unhelpful and arrogant, perhaps because of my Isaan GF.
PLEASE PM ME for details of a bureau in the YWCA building near the embassy who knew all the ins and outs and translated the papers. If they are still in business, your marriage will be a walk in the park.
BTW, my wife could not live in Germany; she missed her family and the Thai lifestyle. But we are still happily together in her Isaan village. Important: marry in the Ban Rak registry office in Bangkok because the embassy can quickly verify their marriage certificate and process the visa for your wife. Good luck.