Hello, that is very honorable of you and I’m glad you’re financially able(most reading here are not). This author is very popular in Japan specifically but if you want to support her you could purchase physical copies that could be sold in your area. There are also official english releases on amazon
I use the Book Depository myself, I boycott Amazon for various reasons.
https://www.bookdepository.com/search?searchTerm=yamane+ayano&ageRangesTotal=21&searchSortBy=pubdate_high_low

Does anyone know the best place to buy her books where most of the profit would go to her? I’d rather support her than go through a third party or a sketchy site. Thank You ٩(๑❛ᴗ❛๑)۶