There are clearly a number of possible options here:
One is that your DD and the teacher just haven't 'gelled' well, and that the teacher has not managed challenge for a high ability child well.
Another is that, while your child is able, her inability to approach challenge independently has led to her being relatively demanding.
The two together, of course, can create a bit of a vicious circle.
I'm picturing a scenario in which your DD completes the main class task quickly, while everyone else is still working on it and the teacher is supporting those who really struggle. A challenge task is available, which your DD takes but, rather than spending time really working at it (as lower ability children may well be doing on the main task, though for your DD this is a relatively unusual situation) immediately says 'I'm stuck' and asks for help.
While of course your DD is as worthy of support as all the other children, if the teacher is at that point putting her utmost energy into children who are really struggling even with the basic work, she may find the fact that your DD is expecting to be immediately helped as soon as she is even slightly stuck a little hard to manage.
Equally, if the teacher sets an art task and your DD gets upset or gives up because she can't do it perfectly, a teacher with an overview of how hard the rest of the class are working at it for perhaps equally low, or lower, results, may be looking for your DD to show greater perseverance and independence.
Developing your DD's ability to work hard at genuinely hard problems - have a look at nrich's higher level problems, for example, making mistakes, going down blind alleys and then finding a way to a solution without help, maybe after an extended period of time or after returning to it several times - may be very helpful in the longer term.
I am not suggesting that your DD shouldn't get her 'teacher time' - through the teacher designing and providing challenge tasks, for example. But it is possible that she may be demanding more, and more instantly, than her 'real need' requires, and that others in the clss are in fact working far harder for much lower results with a better attitude.