UpToSomeGood, I just wanna your post.
Couldn't begin to say it better. Gifted is as gifted does, I guess. I think about my brother (software engineer) who was/is clearly gifted in that very left-brained engineering sort of way, but he's not a particularly happy person. My sister, also very smart, is also a very driven, very hard working person and I think her overall happiness is much, much higher than my brother's and her success level in her field (psychology) and personal life is just as high or higher. I wouldn't doubt that my brother's IQ measured higher, though.
My kids haven't been evaluated through the schools yet, but I wouldn't be surprised if my dd2 is moderately gifted. She's having some trouble this year (2nd grade) finding work that is challenging enough, but they are giving her some enrichment math activities and differentiated time with a higher level reading group.
OP, I'd look at your dd's satisfaction level and challenge level. For my kids, I want them to be challenged enough to find the work interesting and not boring. Next year in 3rd grade our schools' main gifted program begins. (We have programs for highly gifted kids, and a nurturing program for kids who seem to be gifted but aren't achieving that begin earlier.) I don't think my dd2 is HG, but I think she probably is moderately gifted and would get something out of the regular GE program at our school, so I will pursue that next year. I want her to be challenged, but not overwhelmed. I don't want her to be bored and stagnating. On the other hand, I don't want to push her just for the sake of pushing her, either. I want her to be engaged and excited. It sounds like your dd is finding ways of doing just that.
The activities you describe your dd doing certainly sound like something either of my girls would be doing and have done. (My dd1 may be 2E and is a tricky case.) They both always have some story going they're writing and dd2 was really into poetry last year and maybe the year before as well. She'll be 8 this month.