I think Dorinda and Richander must be the same person or as you said Dorinda took the name Richander, on a census there is a RICHANDER LEE married to a James Lee, living with Abraham and Susannah. This must be the ''Dorinda'' Emmett that married James Lee.
Do you already have this census?
If not, it says their children are: Ezekiah Lee (b. 1868) and Fairnette Lee (b. 1869) - (probably Fairnetta).
I will check their baptisms for what they put their mothers name as- Dorinder or Richander.
The only thing is, if Dorinda did adopt the name Richander after her sister who died, there would be a birth/baptism for a DORINDA EMMETT too, unless Abraham and Susannah didn't register the birth of her at all (which I have seen a lot with travellers so who knows

).
Will look for the name of the mum on baptisms for Ezekiah and Fairnette and maybe some kind of record of Dorinda's birth
