Maybe this could be an nice gift for your sister? The difference between parfum and eau de parfum is a slightly lower perfume concentration.
From AllBeauty
Montale - Sensual Instinct 100ml Eau de Parfum Spray for Men and Women
Peacock Bazaar
Montale Sensual Instinct Eau de Parfum 100ml, & 50ml Spray - Peacock Bazaar - 100ml
This product is also available at 4 unverified stores.