Hello R.:
My name is T., a 53 y/o mother of 2 daughters and soon to be 5 grandchildren. I am sure you will hear this a million times that your child is a dream and you just know they are not talking about your child. However, think of this. Your daughter has heard your voice everyday of her life. Now she has new voices to listen to and is beginning to learn about learning, differences, school circulum, the whole world around her. She knows you are there, She counts on you being there every day! Her love for you is so deep, she doesn't have the need to show it, she knows it. Perhaps, try listening more. I know she seems only 5, but children of this age are very smart. My girls and now hearing the stories of my grandchildren send me into gales of laughter. This is nothing to worry about so long as you stay in touch with her. Ask about her day. Take a lead from her if she is talkative or pensive. Think about how you are when you come home from work. Sometimes we just need 30 minutes to chill.
Also, on that note of you being tired; are you sticking to your guns when you answer her or tell her do to something. Do you do things for her, just because you are too tired to argue. Don't argue. Just lay down the law. Do what I ask of you or there will be a penalty. Take away TV or Video. Get her attention, always remembering you are the mother. But she is a person also. You will work this out, I am sure. I was a single mom and these things seem overwhelming. She is growing. You try and take a few moments and just watch and if she wants you to participate in the miracle of a child growing. But children do want guidelines in which to live and help them set their own codes for their lives. Sounds like she is smart and independent! Did she get this from Mom? What could your parents have done ( as none of us are perfect) to have facilitated your growth, but kept you in line.
But mostly have fun with her. If not in 7 years you not be so prepared for her teenage years. And for a girl's teenage years you need your smarts, not yelling and stuff like mine did.
One thing my daughters taught me is they learned how to grow older by doing what I did. They remebered how I handled things. When they told me that I was horrified. I thought, weren't they watching as that decision didn't turn out so well, yet they are repeating it.
Best of Luck and much love to you both.