Naturalization in Bayern (Kreis Freising) No

Hi everyone, I am planning to apply for German naturalization and would like to understand whether a formal language certificate is required.

My background:

-US citizen

-Living in Germany since 2010

-Studied German as a minor in college

-Came to Germany as a Fulbright scholar, where German was a requirement

-Have never taken an official integration or language course and have never needed a language certificate

-Worked full time until 2017 in a bilingual company, but am now a stay at home mother.

-Starting an Ausbildung next year, and no language certificate was required because my German was considered sufficient during the interview process

-Received permanent residency in 2017 without providing a language certificate

-Currently living in Bayern in Kreis Freising

My German is fluent for daily life and professional settings, but I do not have a B1 or B2 certificate.

Questions:

Has anyone applied for naturalization in Kreis Freising and can share their experience?

Is a language certificate strictly required, or can language ability be demonstrated in another way such as an interview, education, or work history?

Would I likely be asked to take a language test despite my background?

Thanks in advance for any insights, especially from Bavaria.