I the cell before it is capped. She then lays eggs on the pupa and they hatch. When I pull a pupa in the purple eye stage out and I find one mite, is this the adult female that entered the cell or is this the result of the eggs she laid?
Here is varroa life cyclehttp://maarec.cas.psu.edu/pest&disease/sl13.htmlhttp://maarec.cas.psu.edu/PDFs/Varroa_Mites_PMP1.pdf
What you ask is that mite goes into cell before capping. Female make several baby generations. In drone cell it has more time to make generations. More youg mites have time to become adult.
If you have only one mite inside capped cell it has not made eggs (for some reason)