Quiet time! Once DS had given up naps (which was a bit before your DS's current age) I really needed equivalent time without chatter, so I used to tell him that he didn't need to take a nap if he didn't want to but he did have to go and play quietly in his room because I wanted time by myself. If your DD is not used to this at all, you may have to introduce the idea slowly, but I think it's a win-win to do it. You need some time when you can hear your own thoughts, and actually so does she: she needs to learn that, and how, she can have fun for extended periods without an adult on tap, and that adults have needs too. IIRR, she's already writing, isn't she? If she's bothered by having nobody to ask questions of, you could make sure she has paper and pencil in her room during quiet time and encourage her to write down any questions she wants to ask you later!
