I know her name relates back to her being an archer, but I think Katniss being named "Katniss" adds to the point that she was most likely coded to be a mixed Native girl since arrowroot/katniss is a plant native to North America, was a staple food for different tribes (AND hunger & food being an important part of the series), & Native Americans are often stereotypically associated with bows & arrows (but in this case it wouldn't be bad, I'd say it's more of a subversion)
This has also been said before but people have GOT to stop asking random natives online for validation on your blood quantum/identity, esp anonymously. We dont know who you are, or your situation, or your true motives. We dont know if you're lying, or if you're exaggerating parts of your story, or even if your information is correct. I'm sure you mean well but like getting validation from random indigenous users online isnt going to make you more native, and most of our answers (and I mean this from experience and from watching other native bloggers get similar questions) all come out essentially in the same vein, because we literally just don't know your situation like you do, and there's only so much you can fit into an ask. If you're REALLY are interested in reconnecting and validating your identity etc then anonymously asking people you don't know online isn't the way to do it. Not in detail, and not reliably, anyway. There's just more reliable ways to find out about yourself than from strangers online!
You'll have to put in the work yourself. Do your own research. Reach out to the tribe you're trying to claim and ask THEM about identity. Read books about Indigeneity from Native scholars. Ask around for alleged indigenous relatives and ask your family. Get involved with the community. You can do it!