We would say she does but we would say they do. So do is the plural verb. Therefore, the answer is, “What do Gloria and I have in common?”

What she does or what she do?

'What did she do" is the correct way to phrase this, not "what did she does." Here are some correct examples: She did something.

When to say does or do?

“Does” is used for singular subjects like “he,” “she,” “it,” “this,” “that,” or “John.” “Do” is used to form imperative sentences, or commands. Example: Do your homework. “Does” is never used to form imperative sentences.