women - Both husband and wife lighting the Chanuka candles separately

For Ashkenazi customs:

I heard (not first hand) that Rabbi Soloveitchik's wife used to light her own candles (with a blessing). Does anyone know of a source that she may have had to support such a minhag halachicly, differing from the Shulchan Aruch / M"B paskin of "Ish Ubeito" grouping husband and wife.