Let me clarify. All Abrahamic religions have strong laws urging against the use of magic. Magic is pretty much the enemy of monotheism in general. A muslim (or culturally muslim) character being a sorceress could be offensive to some people, but it shouldn't be any more offensive than a magic using catholic priest. She wears the hijab but she's not explicitly of any specific muslim denomination.
I'm sure there's some people of the muslim faith who'd get pissed at this, but people aren't burning copies of a Thousand and One Nights to my knowledge, and a lot of things in those stories would be offensive to a practicing muslim, like Aladdin using a genie to perform miracles. There's a long tradition of magic use in arabic culture, and I think as long as it's clear it's a fictional character using non-satanic magics, it should be fine. People always have a right to be offended, but what are you gonna do?