Set Back Meaning

Example : 1898, Winston Churchill, chapter 4, The Celebrity:  â€œWell,” I answered, at first with uncertainty, then with inspiration, “he would do splendidly to lead your cotillon, if you think of having one.” ¶ “So you do not dance, Mr. Crocker?” ¶ I was somewhat set back by her perspicuity.  I expect it will set us back by a day or so, but I think a side trip will be worthwhile.‎  Set it back from the road by twenty or thirty feet.‎  How much do you suppose that fancy dress set her back?‎