How to deal with inconsistent advice from my advisor?
When we work on a big project that requires precise thinking and language, it's easy to get into a mindset of wanting the same kind of precision from the people around us.

But sometimes people with sloppy self-expression do have a surprising amount of helpful feedback to offer.

The less defensive you can get the better.  Try to let go of peeves about contradictions and inconsistencies, and try to leverage her comments so as to keep progressing and improving your results and your writing.