The Sun
I agree on The Empress. Good call there. Also Strength and The Sun. Most especially The Sun.
The Ace of Pentacles and probably the Queen of Pentacles could also indicate good health, Pentacles being the suit of health.
Just FYI (as an addendum) The Star, Judgement and 4/Swords are all about healing and getting better. So if you're looking for cards about someone in not-so-good health getting better, these are the ones.