Letter to fav author

Does any know how i can send a letter to Nagita.Shes know for the anime candy candy Keiko Nagita also know as Kyoko Mizuki helps please thank you !

I don't really know where you can write to, but I've listed below some of the most recent works by Nagita and where fans of those works can write to:

窓をあけて、私の詩をきいて
https://spn-works.com/book/%e7%aa%93%e3%82%92%e3%81%82%e3%81%91%e3%81%...

Contact of its publisher, Shuppan Works:
https://spn-works.com/contact/

青影神話
https://www.poplar.co.jp/book/search/result/archive/4052017.html

Contact of its publisher, Poplar Publishing:
https://reg18.smp.ne.jp/regist/is?SMPFORM=lhnf-ogmfp-99022db705067b7da...

A series of her books at Kodansha:
https://bookclub.kodansha.co.jp/search?_sw=%E5%90%8D%E6%9C%A8%E7%94%B0...

Contact of Kodansha:
https://bookcomi.kds.jp/form/

I hope it helps.