Sounds like your daughter and I are kindred spirits. Your description of your daughter could have been a description of myself at that age. My mom was always nagging me to stop reading, go do this, go do that, go play outside, etc... you know what? I grew up to be a very well-rounded person. Certainly books can be a form of escapism. When I was a teenager, I preferred books over boys, partying, drugs, drinking, and a myriad of other things. Books kept me out of trouble. Books improved my education a hundred-fold. They greatly enlarged my vocabulary. They taught me to spell correctly, to put a sentence together. They taught me how to write in a comprehensive manner. I've noticed that so many adults these days cannot spell or write well. Such important skills! Skills that will last a lifetime. I am the mother of four, and none of them seem to enjoy reading, even though I read to them all from day one. Movies, TV and video games seem to be the entertainment of choice with most kids. But you! You have a reader! That is FANTASTIC! You should pat yourself on the back and treat yourself to a spa day.
As a mother of four, I do understand your dilemma. Your daughter needs to get the basics taken care of in a timely manner. I don't think grounding her from reading is the answer. She is 9 years old. Talk to her. Explain your problem to her. Tell her you need to come up with a solution together. Used to drive me nuts when my mom laid that one on me, but it worked. Help her come up with a way to remind herself to do the things that need to be done. It might work and it might not. It worked about half the time with me. I was always getting in trouble for reading. Reading has served me well in a myriad of ways throughout my 45 years. I didn't turn out too bad. In addition to being the mom of four, I founded and run an international non-profit organization for people with cancer. Where did I acquire the skills? One guess. :0)
Maybe I'm speaking as a kindred spirit to your daughter, or maybe just as a mom who has gone through the teen years three times already, and barely survived. (They are brutal, even with "good" kids.) Please do not discourage her from reading. As excessive as it seems to you, I guarantee you this. It will not become a lifetime problem. She will not wind up in Bookaholics Anonymous due to books ruining her life, health and relationships. Her love of books will be an asset in the long run, especially during the next 7 years. What can seem like a problem at one stage of life can end up being a huge benefit. Look beyond her nine years to the future, and take heart. These small frustrations are actually a blessing in disguise.