What's is she doing the PhD on? I'm on biochemistry and I don't ever do that many hours. I think the most I've done is 60 in a week.
Also, I'm surprised they'd give her the professorship that easily. Unless you're in the states where being a professor is not a title but a job.
I've seen couples with one of them doing a PhD before. It is demanding for both. If you don't think you can handle it then break up now.