I liked the books Ella Enchanted and Ever After and Just Ella and am looking for more of the same: a Cinderella retelling with an independent, feisty and strong heroine

[Regina]

Feisty and strong heroine

[LauraW]

This isn't a Cinderella retelling, but it does have a feisty and strong heroine:
.

[Megan]

Cinder
Cinderella Six Feet Under
And you can also check out this list :)
https://www.goodreads.com/list/show/1...

[Samantha]

Bound by Donna Jo Napoli; it covers the earliest version of Cinderella from China; the heroine is trying to break free from tradition.

[Joseph]

Before Midnight: A Retelling of Cinderella
Phoenix and Ashes
The Fairy Godmother
The Stepsister Scheme
Indexing
Confessions of an Ugly Stepsister
The Glass Casket

[Abigail]

Princess of Glass, by Jessica Day George

[Aerulan]

Howl's Moving Castle by Dianna Wynne Jones
It's not a Cinderella retelling, but it plays with a lot of fairy-tale tropes and the heroine is delightful (just what you seem to be looking for), and so is the writing.

[Sue]

The Fairy Godmother by Mercedes Lackey.
"It is about a young woman named Elena, the daughter of a wealthy gentleman. After the death of her mother, her father married a devious social climber with two daughters of her own. Not long after the marriage, Elena's father dies and her stepmother relegates her into the position of a house servant. She seems to be the perfect Cinderella candidate, except the prince of the land is many years younger than she - he is eleven. Also, she is 21, when most fairy-tale endings for girls normally happen at 16 or 18. One day, Elena's stepmother and stepsisters plan a temporary excursion out of town, for the purpose of ensnaring a new rich husband so they can pay the numerous debts they owe. Left alone in the house, Elena goes to the hiring fair in hopes of finding work as a servant. At the end of the day, a fairy godmother appears and offers to take Elena on as her apprentice. Elena accepts and moves to the godmother's cottage, where she meets the four brownies that help with household duties.
The latter half of the book deals with Elena's time as a full-fledged godmother and her problems with turning an arrogant prince named Alexander into a decent person."

[CraftyChara]

The Captive Maiden Gisela "Cindersela" is strong and sassy.
(view spoiler)[... she actually stood up to her step-mother when she started insulting her dad. (hide spoiler)]

[Rosa]

Cinder Edna

[Ann aka Iftcan]

The Godmother this covers a lot of fairytale tropes, including Cinderella and Snow White and Hansel and Gretel. There is a second book The Godmother's Apprentice

[Martini]

Ash by Malinda Lo

[Kizi180]

Cinder & Ella

[Rosa]

Bella at Midnight

[Ann aka Iftcan]

Accidental Cinderella this one has an interesting take on the "fairy godmother." It's part of a series, but can be read as a standalone. Most of the series is humourous, and this one does have funny parts to it.

[Karen]

Never read it myself but I've heard good things, it's on my TBR: Ella

[Incog]

Cinder (The Lunar Chronicles) by Marissa Meyer

[[deleted user]]

The Princess, the Crone, and the Dung-Cart Knight

[Kaion]

Miss Pettigrew Lives for a Day

[Incog]

Cinder by Marissa Meyer

[Shanna]

Plain Kate Not a fairy tale, but it is magical and has a strong heroine. I thought it was a good story.

[Rainbowheart]

Cinderella Is Dead

[Ann]

An Offer From a Gentleman

[Roxann]

Fairest

[Rainbowheart]

Magic at Midnight