She performed only one time (in 1995) and was a presenter (and award winner) in 2006.
She made a funny video for the award won in 2001 with his former husband Guy Ritchie.
Madonna's nomination and wins at Brit Awards:
1986 Best International Solo Artist Nominated
1987 Best International Solo Artist Nominated
1988 Best International Solo Artist Nominated
1991 Best International Female Nominated
1992 Best International Solo Artist Nominated
1993 Best International Solo Artist Nominated
1995 Best International Female Nominated
1999 Best International Female Nominated
2001 Best International Female WON
2006 Pop Act Nominated
2006 International Album Confessions on a Dance Floor Nominated
2006 International Female Solo Artist WON