DaveZ said "If you look at the website for GE it states that if you are a US Citizen or Permanent Resident you are eligible for PC."
That means you are eligible to apply for it. Applying for PRE and GE are two different applications. Neither one guarantees PRE CHECK.
In regards to my wife not getting PRE on her flight. All of her GE trusted traveler number is in her flight profile with every airline we travel with and is double checked before checking in on-line. So that isn't the problem. You just have to accept the fact that PRE is not a guarantee just because you have PRE or GE clearance.