彼女のことをすごいと思います。 是什麼意思

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You can use "は" instead of "を". It'll still sound natural.
彼女のことはすごいと思います。
The "こと" strongly describing the direction of his feeling. This "は" sentence makes me think he doesn't think the others are great. Actually "は" is usually used to express it.

"彼女のことをすごいとは思います"
It literally says "I think she is great.", but it strongly implies a following "but" is hidden.
I'd translate it to "I think she is great but...". An example of following sentences is "I don't like her personality." or "I think she is doing too hard."

The same thing goes for the first sentence.
彼女のことはすごいと思います。
I'd translate it into "I think she is great but...". And the following sentence may be "Her party looks quite unbalanced."