Mueller questions Cambridge Analytica director Brittany Kaiser

[csziggy]

4. The article says she is fully cooperating

From the quote in the OP: "A spokesman for Brittany Kaiser, former business development director for Cambridge Analytica – which collapsed after the Observer revealed details of its misuse of Facebook data – confirmed that she had been subpoenaed by special counsel Robert Mueller, and was cooperating fully with his investigation.

He added that she was assisting other US congressional and legal investigations into the company’s activities and had voluntarily turned over documents and data.
"

I infer that means she is answering questions.