Of course there are very successful women in Dubai, I am one of them

Seriously, it should be no problem. As in most countries, senior work force is still dominated by men, she of course will need to learn about the business protocols (like shaking hands and that kind of stuff), but in my opinion women are not likely to find obstacles here less or more than they would find them in western countries. Just the other day I was checking a magazine with an article about the top businesswomen in Middle East, wish I could remember the name of it but I saw it really quickly at the airport and can't recall the name.

Good luck!!!