It's about a girl who is a maid and I think she got reincarnated into a book of fairy tales involving princesses (there were princesses who were taking tests about fairy tales. Like "The Princess and the Pea" and how you felt had to feel the pea under the mattress). The MC had brown hair and green eyes and she's cunning. She has a crush on this man who had blonde hair and blue eyes. Everyone one the princesses is taking a test to be the next chosen one who get to marry the blonde haired dude. The MC is forced to do what the other princesses are doing even though she's a maid.
This is Princess Wars.
War for a second chance at life! Han Moli died as she lived: working. When her soul then enters the world of the "Princess Game," she's pitted against other players for a chance at resurrection. But in order to win, she has to marry the prince! As the penniless Princess Pea, does she even stand a chance?
The cover image shows the protagonist, with brown hair and green eyes, and the blonde haired prince.
She was an office worker, not a maid, and abruptly dies as a result of overwork. She's given a chance of a new life as the princess from The Princess and the Pea and must compete with other princesses from other fairy tales.
During the test to see if anyone could detect the pea under a mattress, one of the candidates cheats to remove all of the peas from the other mattresses. The protagonist confronts her over this but is unable to prove the other woman cheated. As a result, the protagonist is asked to serve as a maid instead of a princess.