[Malte] Cloistered Convent in Vittoriosa?

[q24angel]

My grandfather who was born in 1884, had a sister who was born shortly before or after him. Because his mother died when they were young (perhaps during childbirth), the sister was apparently sent off to live in a cloistered convent. He never had any contact with her after that. She has always been a mystery in the family.. we don't even know her name.

Were there more than one convents like this at that time? And does anyone know if it is possible to get any information about young girls who entered and lived there?

Carol