No, I don't think Shelob had any 'spells'. Except for perhaps fear, but then while that was in a sense magic, it comes still under the Hobbit's 'resilience'.
I think that the fact Sam did not resist Frodo taking the Ring from him again was because, having borne it for that short space of time as he did, he perhaps had an inkling of what Frodo was feeling and knew that he had to have it back. He was down to earth, and was not interested in power but getting the job done.
But of course, had he borne it for longer I am sure it would have sunk its talons in eventually.
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