She will probably someday compete exclusively on the men's tour. In order to do that, whe will definitely need to build her upper body strength, especially her forearm and grip strength. the biggest difference between the men pros and the women pros, besides maybe raw distance, is the short game. the additional strength in the forearms and hands is what allows men to be able to play shots and display touch around the greens that women simply don't have.
Mili is right, she is so tall and has such a huge arc and such flexibility, that she can generate enough clubhead speed to compete with the men (by contrast, Annika is physically stronger, but hits the ball much shorter than Michelle). she will have to develop abnormal upper body strength for a woman golfer, however, to ever have the ability to handle the deeper rough and tougher pin placements which the men face.
Think of how Tiger Woods dominated the 2000 US Open, and how he hit shots out of the rough - both full shots and around the green - that other players in the field were not able to hit. then compare the difference in strength between Michelle and the average male Pro (substantial), and the difference in strength between Tiger and the average male Pro (not nearly as great). She is at a huge disadvantage in this area.
I really hope she starts on the LPGA, is totally dominant there by the time she is 20, and then goes through Q School and earns a PGA tour card.
You still can't account for the stupidity of the media, however. Mike Ritz of the golf Channel interviewed her after the round, and said, "So now that you've proved that you can make the cut on the men's tour....." I'm sorry, but she hasn't proven that yet - she didn't make the damn cut! but she did prove that as ong as she keeps progressing, she may be able to do more than just make cuts on the PGA tour. She proved she has great potential.