SHE IS VERY "MANIATIC"??
There is always a temptation to take Spanish words and try to covert them into English. I would not discourage this because sometimes it works but, on the other hand, sometimes it doesn't!
The word "maniatic" is a good example of this and comes from the Spanish word "maniático". Unfortunately it does not work in English and you will confuse a native speaker if you use it. My prefered translation of this word is "obsessive" or "fanatic".
So, for example: "He is completely obsessive about how clean his house should be." or "She is a fanatic about learning every phrasal verb in English."
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.