Although she looks extremely fit and strong, I would say that she'll have some trouble with the length and thickness of the rough, that is if she ever gets in it. Also, like Tom said, if the conditions were similar to what they can and do get the course like for the Wilson and what it will likely be like for the Amateur, she'll have some pretty interesting plays to the greens. Her play around the greens will really dictate the kind of number she'll shoot. Then there's the last line of defense; the greens themselves. It'll be interesting to see how she putts on them. I saw Ernie Els putting on 14 through 17 last week and he didn't look like he had them figured out. Now he was playing in an outing for some banker types so who knows how hard he was trying; but he sure as heck wasn't trying to miss.
I've never been to an LPGA event, but aren't there pretty big differences between the course setups for the big tour and the ladies? For that matter, there's probably a huge difference between course setup on the big tour and the senior circuit.
I watched Ryan Moore last year and if his game was totally on, I guess he could be Annika; but all the time? I'm not so sure. I think she'd win less than half the time, but not much.
The course set-up and yardage is key, but I'd guess she plays Merion 3-4 strokes higher but if it is as SPDB predicts, I wouldn't be surprised. It's gonna be hot and humid tomorrow too, so the conditions should be similar.