She doesn't heal like Jasmine does. She's not really a healer, more support. And any healing happens in smaller amounts compared to Jasmine.
As for the boarder, that comes from the higher quality rune sets. So like the Ruby, Opal and Sapphire. One of those equipped with two other Precious runes will give you the thin boarder. To get the complete frame, you need the whole set. So all the Rubies, or all the Sapphires.
Yesterday I spent close to 20,000 diamonds upgrading Quaky to 6 stars (from 3) - this was done through the special event, not conjuring stone. A rough calculation has me working out that in order to upgrade a hero from 6 stars to 7, we'll also require a maximum of 20,000 diamonds (per hero) depending on how the pulls turn out in the special event. Now I've got 20,000 diamonds left - depending on who's event comes next, it'll either be Mirah or Ursula who get to 7 stars in my deck.