So far, it's just minimal. Not as much as Yavanna does, but considering her past history of serving Sauron, she would know about the poison-filled arrows that the Orcs use. 

Also, Saeril remembers using Athelas back in Fangorn when her kind was still alive. So far, she knows a few healing spells, I just haven't elaborated them yet. 

Also, didn't we miss a scene? Where the Orcs attacked the house? And that Tauriel and Legolas saved them? That would be before they received the Kingsfoil.