Her magic

...the power in her hands...

Yuuko is definitely a powerful witch and that means she has an extraordinary power that gave her the reputation as Dimensional Witch.
In this page I’ll analyze some of her arcane abilities and magic powers.

Seeing unseen things

This is the first power we come to know, at the beginning of the series, where she comes in contact for the first time with Watanuki, she reads his background using a mirror and a seer pool with the knowledge of his real name and a personal object.

Your birthplace is not where you live now. You have moved several times. You have a deft had and are good in with housework. That’s good because your situation forces housework upon you. Now, or rather since childhood, you have had a worry. And since it’s a part of your family heritage, you can do nothing about it. And it’s a worry that has to do with the occult. You see spirits, don’t you?

-Volume 1, pp. 21-24

Creating mystical objects

Here is a vast category of things she can create, but the most important object, if we can call it that way, are definitely the two Mokona Modoki - . They are special, because she didn’t do them alone, but together with Clow Reed, and they were made for an exact moment that will happen in past/present/future. This could be also saying that she and Clow created gods, because the original Mokona from Magic Knight Rayearth is the god who crated earth and the world where the main characters go to fight.

[…] In any case I met this one that look like those delicious bean-jam rice cakes you eat while sightseeing in the snow. Me… and one other.[ …] We came across this alternate existence and made this twins. We made them for two who are the same as, yet different from, blood relations of Clow. […] We made these to give to Syaoran-kun and Sakura-chan of a different world. Or… to tell the whole truth, Sakura and Syaoran, and two others who need them.

-Volume 2, pp. 14 – 17

There is also the creation of the “Aurora Path” passage to Ginza from her shop. From the store to Ginza is a long way and probably walking there would take hours.

I was playing a certain game, and I came across this path. I thought about it and realized that it was possible, so I tried to make one. It’s pretty good. Very convenient.

- Volume 1, p. 117

Endowing People and objects with power

Yuuko can write a name on a metal baseball bat and this will have the same powers as the item which’s name was taken.

Listen… the names are very important things. […] Names have power. With living thigs or inanimate depending on the names we give them. A thing can have the same power as that for which it was named.

-Volume 1. p.154

She can also speak or deliver messages with her voice through Maru and Moro.

Here, I’m talking to you through Maru and Moro.

-Volume 2. p. 9

Transforming a handkerchief in a flying animal (butterfly, bird) that searches for the person/item/location who she wants to find.

Since it’s a butterfly, we can assume that the one we are searching for is close by. Lets follow it.

-Volume 2. p. 80