I read this a few years back and have searched for it multiple times (since I forgot the name) but cannot find it anymore.
The female main character (MC) reincarnates into a baby. When she is a few years old, she gets a teacher to learn how to summon sprits, but she is impatient and the night before, she tries to do it herself. She draws the magic circle and then summons the spirit. She summons a spirit that needs to live in/eat metal and it lives in a candleholder.
The next day, she meets with her teacher and they confirm she has an affinity for water spirits, so the teacher helps her summons the lowest water spirit undine. When she ask the teacher about the spirit she summoned the night before, the teacher thinks she's lying because there is no such thing as a metal spirit.
The story then makes a skip and the MC is 18. She is making a summoning circle to summon the highest water spirit. She succeeds and becomes the youngest person to ever do so. The story was not completed back then and that was where it ended. It was just a few chapters but I really wish to read it again.
Thanks in advance to anyone who took the time to read this.