Answering the original question, if Shelob had not been there in the first place, Sauron would just have doubled the guard on Cirith Ungol and in Minas Morgul, and things would'n have been much different.
And, if Shelob died, I guess more or less the same would happen. And I don't think that Sauron could "make" a spider. I guess that if he really needed one, he would send out troops to get one (I mean, he has enough of them little orcses).
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