Dark Habits (1983) on Netflix

Yolanda sings in a seedy nightclub. When her boyfriend dies of an overdose, she fears the police and seeks refuge in a convent that saves women from the streets. These off-beat nuns include a heroin using abbess who loves Yolanda, one who writes romance novels under a pseudonym, another raising a tiger in the convent yard, and one who designs fabulous fashions and is in love with the local priest. They plan an evening extravaganza starring Yolanda to celebrate the abbess's birthday and to convince their wealthy patron not to abandon them.