Hermaphordite

I'm growing a single plant from a seed I found...thought I was fortunate to get a female, but after 4-5 weeks of flowering I'm starting to see seeds developing in some of the flowers.
Should I just let it finish? ...it only has a week or two to be ready.

Since you only have one you might as well let her finish. But you will need to spray down EVERYTHING in your grow room afterwards with diluted bleach or H2O2 to sterilize any pollen. It can seed your next crop if you don't.

just plain water will kill pollen but like said above clean everything inside and out fans, lights, pots, cords, exc or it will haunt you later