In this book, the protagonist, Luna, is abandoned as a baby and raised by a witch who accidentally feeds her moonbeams, giving her extraordinary powers. These powers manifest in various ways, including:
* Reading people's emotions: Luna can sense the emotions of others through their words, actions, and even their objects.
* Moving objects with her mind: She uses telekinesis to move objects and even fly.
* Healing: Luna possesses a powerful healing touch.
While the book doesn't specifically mention "maths" as a power, the way she manipulates and understands the world around her could be interpreted as a unique form of mathematical understanding.
Let me know if this is the book you were thinking of!