At her international debut during the Wch Allround of 1967 in Deventer she finished 27th.

A year later, during the op het Wch Allround of 1968, she had improved to become 16th.

Progress was such that the next year this had become the 4th place overall, while she won a silver distance medal on the 500m.

At the World Sprint Championships of 1971 in Inzell Schleiermacher wins her first and only international title, becoming the successor of Lyudmila Titova from the Soviet Union.

Over the course of her career, Schleiermacher skated one official world record: Note that her best score on the sprint combination was skated before there was an official world record for that event.