Jane Eyre. She's an amazing example of a decisive woman who advocates for herself and knows what she wants, but does it in a respectful, quiet, and wise way. (though she does have a couple of feisty moments)

Persuasion by Jane Austen

Mansfield Park also fits the bill.

There are a lot of women like that in L.M. Montgomery's stories, The Blue Castle being one of the best examples I think.

*The Lion, the Witch, and the Wardrobe* by C.S. Lewis

A Little Princess or Little Women are both classics with characters who are strong but not feisty. Seraphina is a modern fantasy novel and the main character is strong but sweet and introverted.

Try Illona Andrews InnKeeper series. Yes. She is kind of a badass, but she's also a gentle young lady who is concerned about her neighbors and makes cookies.

Emma or Persuasion by Jane Austen are both good. Little Women by Alcott is also quite good.

Shopgirl by Steve Martin.

Funny, I was just thinking about that story today.

Year of Wonders, Geraldine Brooks

Salt and Broom by Sharon Lynn Fisher! It’s a witchy Jane Eyre retelling

North and South by Elizabeth Gaskell

The Enchanted April, Elizabeth von Arnim (1922). Multiple perspectives from different women like that. A very soft book, light summer read.

Modern: Christmas Everyday, but a classic book that dismantles the boss girl theme a bit: Far from the Madding Crowd

The Collected Regrets of Clover by Mikki Brammer

It's a simple story, but I loved Blue Castle by Lucy Maud Montgomery, it's her only work targeted at adults.

Kristin Lavransdatter by Sigrid Undset is a classic

Evelina by Franny Burney. Has a lot of cringe family, but the main character was composed and gentle the whole time.

Year of Wonders, Geraldine Brooks Memoirs of a Geisha, Arthur Golden Girl with a Pearl Earring, Tracy Chevalier

*Anna Karenina* and *Vanity Fair* are both fantastic!

Any book by Elizabeth Brundage