So, to explain the German „sie/Sie“, it can be used as one of the following:
formal version of both singular and plural you: used whenever you have or want to maintain a distance from someone, or with persons who demand respect/authority. Generally speaking, whenever you would say Mr/Mrs/Ms it’s „Sie“, if you’re on first name terms it’s „Du“. Fun fact: addressing an LEO, judge, etc. informally („Du“) is considered an insult, insulting someone is a misdemeanour (not kidding) in Germany, and you will usually be fined on the spot for doing so.
Used to reference a woman/girl who has been mentioned before: What about Sally, is she coming today?
Same as above but for inanimate objects or animals that are gendered female: Have you seen my camera, I have misplaced her. Look at the cat, she’s so cute. (In this case it’s a cat of either female or unknown gender, if you were talking about a male cat specifically, you’d use the male version of „cat“…)
Same as above, but for all groups of people, animals, objects, regardless of gender, like plural they: Look at the guys/nuns/politicians/cats/helicopters, they’re drunk as fuck!