I could read about a year and a half before I started school. I was never bored, but that was mainly because I had so many interesting things to think about- things I read, outdoors activities, crafts- that life itself was interesting. I didn't have a problem with listening with half an ear, answering questions when called on to do so, and spending my spare time making up stories or planning new adventures.
And I grew up in a culture that was less rigidly focused on the Three 'Rs and worksheets, so I didn't feel time was wasted if I wasn't progressing at a set level with those things.
What I would say, though, is this time before she goes to school is a golden time to teach her all the things she will have less time for later: how to recognise all the birds in the neighbourhood and understand their behaviour, how to tell flowers and trees apart and understand about bees and hoverflies, how to do simple crafts, learn lots of songs, paint, make up stories, bake and cook under supervision, grow her own little garden on the windowsill, play games and do basic sports, listen to lots of stories, nursery rhymes, poetry.
All these things will stand her in good stead later: she will have a well-developed linguistic grounding and a framework to build her reading and writing on.