I know what she said. I believe she made the suggestion on the basis of naturalness, therefore, I asked what walk to sounds to her ear that makes it not as natural.
With all due respect, the searches are abused (sorry, the word shouldn't be taken as offensive. I used it for a lack of a better word). For example, do a search for "I" and "him" or "John", can you infer than "John" is less natural? My point is some contexts occur more often than others but doesn't mean others are not natural. I believe you do not mean ":walked over" is less natural than the others. If so, ignore this message.