Wow, that's quite quick improvement imho.
I strongly belive she is going to be all right and will make 100% recovery.
Despite all the medical sciences advancements and almost magical (to layman) technology used nowdays they in reality know nothing more than 100 years ago (when you are doctor with almost 40 years of experience like my father you get extremely humble and start to go to church much more often then you used to...)
I heard of brain damage cases beyond human understanding and beyond any hope making full recovery (I had quite unpleasant encounter with four pissed-off-bald-headed killers once and spend two weeks on neurology ward with over 1 cm brain swelling and unrecognizeable facial features, I am at high risk of stroke all the time and have some nasty scarring on brain tissue but I am fine, well according to some people at least
)
.... Medicine know very little about human brain and some specialists are of opinion that it has unbelievalbe redundancy and self repair abilities.
I think it is extremely important now to find a balance between necessary stimulation given to your wife's brian and tireness and stress caused by it.
I can still see my uni friend laying on her hospital bed like vegeatable week after week groving thinner and thinner and then, two years later she was like new, graduating with degree from the uni.
Heads up, she will be fine!