Nope, not too early at all. In fact, it might be time for you to sit down with her and have some girl talk as well. Doesn't have to be the sex talk, just talk about her body going through changes and how she can take care of herself properly. Like if she isn't wearing deoderant, you can talk to her about that, why we where it and if she feels she needs to. I don't remember when I started wearing it but I already had to buy it for my soon to be 9yr old because her pits were starting to get stinky!! You can talk to her about her skin getting oily and how and what to use to clean her face, possibly her period as well, bras, etc. Keep it simple, and get her to talk too so you aren't doing all the work.
Most importantly, compliment her!! Tell her her hair looks nice or how well her shoes go with her outfit type stuff. Work on building her confidence so she doesn't fall into that 'i can't leave the house without make up on' trap as she grows up!! And watch what you do around her too when it comes to clothes, hair and even with your male relationships (you didn't say if you were married or boyfriend) because you are going to be her unspoken guide as well. Watch her friends too. Now is a great time to keep your finger (without being noticed) on her friendships with other girls. Peer presure to smoke, skip school, drink, boys can all start at this age too. Don't think because you know your daughter that she wouldn't do anything think that either. The power and the need to have friends can over come all that you have ever taught her!!
For being pluged in-limit it. 1/2 hr blocks totaling 2 hrs a day or 2hrs a day and that's that. You aren't cutting off her life line but she needs to remember there are more important things in life than texting!!
Good luck!
S.