Table: moldovan_badminton_champs
Columns: year
mens_singles
womens_singles
mens_doubles
womens_doubles
mixed_doubles

Question: How many mixed doubles were there in the year that Olga Koseli won the women's singles?
SQL: SELECT COUNT("mixed_doubles") FROM moldovan_badminton_champs WHERE "womens_singles" = 'Olga Koseli'