I'm sorry, OP.
That's the age when my gifted kid went into the MCPS elementary school magnet. Before that, she used to bring all sorts of books to read and occasionally her teachers would throw her a more involved math worksheet than the curriculum called for. At home, she read some more and we did Beast Academy (from Art of Problem Solving, excellent math program, highly recommend).
DD returned to her home school for middle and high, because the secondary school magnets involved a long bus ride and she didn't want that. She was fast tracked for math (Algebra 1 in 6th), and started a foreign language. In her public school, the English classes are abysmal, so she keeps reading on her chromebook even in 10th grade "Honors" English class - the class has spent a month reading the first pages of Odysseus, so she's going cRaZy and has spent the last month reading 1984, Dracula, Frankenstein and Dr. Jekyll and Mr. Hyde (basically, anything she can get her hands on in the online library that's not blocked on the MCPS chromebook). But thankfully, all her other classes are more interesting, because they're all AP level.
All of this to say... your child has a long road ahead of her, in terms of getting used to boredom at school. She should think of school as a place to socialize and catch up on her reading
Also, find challenging non-academic things outside of class. DD started violin at 3, and has become quite proficient at it. She's been in youth orchestras for years and participates in competitions, etc.