I spoke to Dr. McGinn's staff and this is what they wrote back
"Unfortunately, now that you are post-op the hair can not be removed by Electrolysis inside the
Vagina. There is no way for the technician to see inside you or fit the tools required inside to treat
the hair" and "I'm sorry but that would be very tough to do".
Makes sense. How the hell can they see inside?
They might however help with the scar.

I guess for now, I can continue plucking (with fingers) hairs from inside.
I thought of using Vaniqa inside vagina but I'm scared it might cause skin complications inside and be absorbed into the body and have side-effects. Also it's expensive and needs to be continued forever. No thanks.
Like I said, Dr. B tried to cauterize a second time, going inside while under local anesthesia. No improvement and it cost me 500$, hospitalization fees.
I can perhaps try Estrace cream. Who knows? What have I got to lose? $$$...