Dear all let me outline the siddhi and specific details for this Yakshi.
For attaining the perfection or siddhi one has to do the japa for 2 lakh times the moola mantra with samyama and vrutha. Then after this; 20,000 numbers of ucchamalari flower has to be offered as homa.
The last steps are similar to that mentioned in the generic Yakshi sadhana. The difference between the two Yakshinis are Vada Yakshini can be used not only for attaining the desires but also for annihilation of enemies. There is a risk which is applicable to normal tantriks in this regard. If you send a Vada Yakshini against your enemies and she fails in the attempt, your life is at risk. She comes back and creates havoc. So this is one of the dangerous among Yakshini Ma's. :)
Secondly she prefer to stay in big trees with scented flowers. In this form she can be invoked and kept as a protector for family. It was a tradition that tantric families in vamachara has a Vada Yakshini invoked and kept for generations in the big tree in the premises.
From the perspective of an aghori, she is Ma and invoking her is similar to that of any other Yakshini. But aghori will ask for celestial mileage and help for spiritual wattage for his realization from this Ma.
