It's called the Vorkosigan Saga. By Lois McMaster Bujold
Spoiler
Cordelia from that series is one of my favorite characters ever, even if she already started out as an adult with emotional maturity.
Just because there was less room for obvious growth doesn't mean she doesn't end up growing and developing anyhow, by exploring different aspects and even in one of the hardest ways to show growth -learning how NOT to exert power.
Lots and lots and lots of books out there demonstrate characters FINDING their personal power and learning to exert it (especially YA novels) but very few write about learning to tell when it's important NOT to do so, and developing self-restraint. I admire that character so much
I like original-language, too, but I also like reading a book BEFORE I spend the money to buy and own it, so I'll read a translation in a library before I'll spend the money on buying it in the original language, to at least give me a little more of a notion.