She performed major parts of classical as well as modern ballet, as a partner of dancers such as Richard Cragun, Rudolf Nureyev and Mikhail Baryshnikov.

Choreographers John Cranko, Eliot Feld, Marcia Haydée, Jirí Kylián, Kenneth MacMillan, Hans van Manen, John Neumeier, Uwe Scholz, Heinz Spoerli, Glen Tetley and Peter Wright created choreographies for her.

She has been director and professor of the Akademie des Tanzes (Academy of Dance) at the Hochschule für Musik und Darstellende Kunst Mannheim, teaching classical ballet, repertory, variations and pas de deux.

[1] She received the Preis des Verbands der deutschen Kritiker in 1981, an Emmy Award in 1984, the John Cranko Medal in 1985, the Order of Merit of Germany in 1985, the Deutscher Tanzpreis in 1998, and the Großer Sudetendeutscher Kulturpreis in 1999.

[2] Since 1968, Keil has been in "a private as well as professional partnership" with Vladimir Klos, who was a principal dancer with the Stuttgart Ballet from 1972–97.