sniff around (someone's) business

Translations
вынюхивать в (чьих-то) делах
She was sniffing around her business, trying to find out her secrets.
Она вынюхивала в её делах, пытаясь узнать её секреты.
Definitions
To investigate, pry into, or show curiosity about someone's personal affairs or private matters, often in a way that is intrusive or unwelcome.