Kniezková was born 21 August 1975 in Havířov. She competed in three Paralympic Games, each time in the discus and javelin. Her first appearance in the 2000 Summer Paralympics was her most successful, winning the F51-54 discus and finishing second in the F52-54 javelin. Then in 2004 in Athens she defended her discus title in the F32-34/51-53 class but couldn't quite win a medal in the javelin. In Beijing in the 2008 Summer Paralympics she was unable to win a medal in either the discus or javelin. She died on 24 February 2015.