I'm no expert, but from what I understand it takes several months (4-6 perhaps) to get a true reading of your blood levels after being on PB. If you're wife's only been on this diet for roughly 6 weeks, those numbers probably don't say much about the changes she has made.
Also, if you haven't done so already, look up the ratio by Grizz or Griff, can't remember who's it is. They may not be so bad, but I have no clue.
Good luck and try to get her to hold on for awhile!