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Real question: did the dead prophet Samuel speak to Saul because the witch of Endor had conjured him up, or because God had willed a miracle at that moment?

Scripture is clear that what is intended for evil, God turns for good (example: Joseph, Genesis 50).

This is yet another example of that: The evil intended here is to conjure up a deceased spirit to bypass God's ways of guidance.

God allowed that to happen for the express purpose of judgment: Samuel pronounced that judgment, which was then promptly fulfilled the following day.

As for your specific Q about the conjuring powers of the witch...note (a) she was frightened/surprised that he actually showed...meaning she had no ongoing experience with this; and (b) humans -- or demons -- don't have the inherent power to bring people back from the dead (Luke 16:24-31; Heb. 9:27)

Scripture does record that He opened the mouth of Balaam’s donkey, and she spoke.

Yes...people can read this in Numbers 22