I myself am gifted, or, as we call it in the Netherlands, 'highly intelligent' and had IQ scores of around 145-150 throughout the years. However, I have learned from my psychiatrist that a high IQ alone doesn't establish someone as 'gifted'. You need to excell in multiple things, the most common denominator being 4. 1) something academic, like languages, maths or physics. You can't excell in all academic subjects (well, you can, but it's unlikely), because something's gotta give in your brain. In my case it's languages and logical reasoning, but I am lost with numbers. There's just no space for it in my mind. 2) something creative, like drawing, painting, writing, making pottery, you name it. 3) something we call here 'psychomotor related', activities where you use your brain and body at the same time, like dancing, gymnastics, or ball sports. 4) you have to have quite a lot of psychological symptoms, in the netherlands there are 39 (of which I have 32 lol), like getting overwhelmed quickly, because your brain absorbs allll info it gets, having an outstanding memory, having trouble feeling physical clues you're tired/sick because you only live in your head etc etc.
Only if you consistently have a high IQ and check the other 4 boxes I just mentioned only then you are considered gifted or highly intelligent here. Just academic succes ain't cutting it.
I don't think Ruby really has the IQ she says she has, because then her writing, obviously her creative field of interest, should have been LOADS better. When it comes to the psychomotoric things, I don't think a psychiatrist counts twirling in a field.