From the wiki:
>One day, Yūko and Clow encountered the original Mokona, who was traveling through different worlds, and Mokona provided Yūko and Clow with the knowledge of alternate dimensions. After learning that one day a Sakura and Syaoran from an alternate world would come to their world to ask for help, Yūko and Clow created the two Mokona, basing them on the original but with slight differences, such as difference in size and the ability to talk (whereas the original Mokona would only say "Puu!"). Each Mokona was also given an earring which matched the color of the gem on its forehead, the blue earring seals magic power while the red earring boosts magic power.
So wherever she is, Clow Reed is from it too. So is it safe to say she has as much power as him?