Dead Alive (1992) on Netflix

A poisonous Sumatran rat-monkey is taken from a desert island to a zoo in New Zealand. Lionel takes his new girlfriend Paquita there. His pain-in-the-ass mother follows him, probably suffering from some kind of reverse Oedipus complex. She is bitten by the monkey and gradually dies and turns into a zombie. Then she goes around hunting people, and everybody she bites also turn into zombies. Lionel has bigger and bigger problems fighting the zombies and hiding them from Paquita and the rest of the world. Finally, Lionel and Paquita get into a fight with hundreds of zombies during a party of unwanted guests at Lionel's home.