Let's imagine a situation where she promised to do something(Not such an important thing yet important) but failed to do that on time(She did it after asking her to do it again)

This is I used to do it. I never explained by displeasure but just stopped communicating the way I used to communicate and she'd ask me if she did something wrong and then, I might explain her if she asks many times.

She asked me if I can communicate what I want directly to her, she can do whatever I want the way I want it perfectly.

I was pretty much reluctant to direct her to do XYZ but later I thought If I were to treat her like a plate, it's just not a long term solution. So I thought I'd be straight-forward with her if I feel disagreement rather than not talking with her much to show my displeasure.

The problem now is she is tell me I'm blaming her for all the things She's telling me she's the one who's always doing the wrong things. It's always her mistake and so on. What did she expect when she said "Open up with me so that I can do as you like". These women are so difficult to understand. Our fights are increasing and its making me uncomfortable and possibly its making her uncomfortable too.

How do you deal with fights? How do you express your disagreement? How do you express anger?