I am pretty sure DP03_0011PE is the estimate of percent females age 16+ in the labor force. The line numbers (like 0002 and 0011) in the API come from the table shells, so sometimes it's helpful to go to the original table (on FactFinder, for example) to compare. The original table here can be found at
factfinder.census.gov/.../DP03 if you count to line 11, you'll see that the universe (shown on line 10) is females.
But I agree with you on this: the descriptions in the API dictionary and the column headers in the original table are confusing!