Btth CAI Lin/ Medusa

So medusa Dou Di bloodline I just realized how does she have dou di bloodline? Since her clan is a tribe not like those clan or sect and they are kinda isolated it's small or did she become Dou Di or does have dou di bloodline is because at the end of the novel xiao Yan tear the vortex and gave her origin qi to advance to become Dou Di and have the bloodline awaken through her?