Having taken the other thread off-topic, I thought I'd mitigate a little by bringing my response back to this thread.
Yeah, the doctors will drive you crazy that way. They never seem to tell patients what to expect. I think it's because they're not entirely sure what to expect, and they don't want to frighten us with all the possibilities.
What my neuropsychologist also said is that neurosurgeons, in particular, seem to have a skewed perception of reality: "You can walk, you can talk, go live your life." Uh huh.
It's still very early in her recovery, and from reading other accounts, this will pass. For now, please consider looking into neurocognitive therapy for your wife. A TBI center will have many resources and services that can help her recover more quickly.
If it were me, though, I would point out to the doctors that it was less than helpful not to be warned about what to expect. A little venting might be good for the soul, and perhaps if a similar situation arises in the future (although I hope not), they will be a bit more careful to offer a more complete explanation of what you can expect.
Please keep us posted about how she's doing.