Hi, your DD sounds similar to mine, only I made the mistake of waiting until this Easter to start home educating her (she's 8) and wish I had done it right from the start. She was in a special measures school, is very bright too, but she spent most of her school days being held back by teachers who were set on the whole class learning at the same pace, regardless of ability. She was constantly bored, and was sometimes teased about being better at certain subjects than some of the other kids. It also annoyed her greatly when she was really 'into' a topic, only for it to then end and work would start on a new topic. Certain teachers also did not seem to treat her fairly, in many ways.
You are HE'ing your DD already, and it sounds like you are doing an excellent job!
I don't work at the moment, so can't really comment on how that would work for you. You do not have to do X hours daily/weekly and you do not have to follow any sort of curriculum (although some do, some don't, and some do a bit!)
We haven't been HE'ing for long, but so far we have been following the national curriculum a little bit, in numeracy, but basically my DD just learns what she feels like learning each day. We're very informal, and haven't done much written work, as most of my DD's learning takes place through conversation/discussions, researching using the internet and books, or simply asking 'someone who knows' like other family members!
If you do decide to HE, without your DD ever attending school, you do not have to let your local school or Local Authority know - that's only for those that have been registered at a school already.
Hope this helps a little,
FBB