She's probably as qualified as Dennis Avery, who is one of the authors of the first of the two books mentioned in the Drudge blurb. Avery is an economist, not a scientist, which makes him no more qualified than an English teacher, Mary Kay salesperson, or Al Gore to give a scientific opinion on global warming.
What do you think of Fred Singer, who was Avery's co-author for this book?
If you're talking about science, you might be surprised about economists' qualifications. The average Ph.D. economist is better-trained at formulating and testing mathematical and statistical models than is Dr. Cullen. Economists are hands-down the best analysts of simultaneous equations models, among other techniques, many of which are used by "global warming" researchers. I don't know where you got your opinion about economics training, but you really shouldn't shoot from the hip like that.
In addition, a VERY large part of the global-warming-is-caused-by-humans crowd's argument is the bogus "economic" report that surfaced last year about how global warming was going to destroy the world's economy. How else would you suggest the economic impact of alternative scenarios be assessed? By a physicist?