Rani durgavati belonged to the Gond Kingdom. And the Gond Kingdom was very rich, thats why he tried to maintain a bond with Rani Durgavati. The Gond Kingdom exported elephants to many empires including the mughal. One of the reason why Akbar invaded Garh Katanga was his desire to capture this resource. And thus akbar was very keen in making Rani Durgavati the vassal of mughal empire.