How do I know what's going on and why the delay on my N400?

I did my interview. It was very easy. It took less than 15 minute and there was no issue. Officer told me she need to review the file. She said to pass English and civic but she can't make decision now. I asked what I need to expect. She said 30 days if she need any evidence, and 90 to the oath. I did two requests. First, they said file in decisional phase. Second request, they said application is pending. By the way, they said that they need no evidence.