Changes

=== Simple implementation ===

The following does exactly what is asked:

*In the View menu, select ''Person Filter Editor''

*Click on ''Add a New Filter''. In the Define filter dialog, give the filter the name ''Female descendants of Joan Doe''

*Click again on ''Add another rule'', and now go to ''General filters'', and select the rule ''females''

*In the options section of the Define filter dialog, make sure ''all rules must apply'', is selected

=== A variation: also return unknown sex ===

You might want to add the people with unknown sex to the output. For this, you need to combine two filters: