She worked with the U.S. Army physician John Prior and with fellow Belgian nurse Renée Lemaire, treating injured soldiers during the Battle of the Bulge.

At that time the town seemed safely in American hands, but within days was surrounded by German troops advancing into Belgium during the Battle of the Bulge.

Chiwy worked at the aid station in the Rue Neufchateau, and even donned an Army uniform in order to go out into the field to collect the wounded while under fire.

[4][5] On 24 December 1944, the first aid station was hit by a German bomb, killing over 30 wounded men and another volunteer nurse, Renée Lemaire.

British historian Martin King, while researching his book Voices of the Bulge, finally tracked her down in a retirement home near Brussels, hearing her story, and bringing her to public attention.