My grandmother was brought to a camp when she was 2 and stayed there till she was 16.
If she ended up at Finkenschlag, she must have been in another camp before being moved there as it was only open for about 5 years ( 1945-9 ), and this camp was for displaced persons.
There appears to be very little information about it, but in this link it mentions dates and population of the camp. It also mentions a place/camp called Hardhohe which appears to have been amalgamated with Finkenschlag. I think this was part of Furth, as today it is a metro station.
I can't find much info about it from Jewish sources either, only that it was a camp for Jewish Holocaust survivors.