I'm with puffin here-- I know, I know, surprise-surprise, because usually I'm kind of ambivalent about testing.
My DD is another one that doesn't really have any amazing party tricks. She wasn't hyperlexic, wasn't one of those amazing "mathy" seeming kids, didn't really learn to read all that early (4-5)...
she was just... MORE. Very obviously so if you took even a few moments to talk to her. She adjusted to whoever she was speaking to, and made conversation the way adults do. When she was 2-4yo, I mean. You could always see the penny drop with people when they suddenly realized, five to ten minutes into things, that they were having this conversation with a tiny alien-like person. A person whose major interests SHOULD have been Teletubbies and the color pink.
But anyway, as puffin suggests, follow her lead, teach her how to enjoy being in her own head, and have fun.
My DD14 hasn't ever been tested formally because we've not needed to in order to get cooperation from local educational authorities (including a 3y acceleration), but her SAT scores at 13yo easily qualify her for any programs that she would be interested in, so she's very clearly HG+, and probably considerably +.
Does that help? The trouble with having a well-rounded kid like this is that it can be easy to lose sight of just HOW out-there they are. Until school time, though, just letting them be themselves full time is the best thing that you can possibly accomplish, IMO.