Early dungeons Eos can just Embrace and Whispering Dawn the party most of the time, though the odd Physick may need to be thrown in. At higher levels (35-40 onwards maybe?) you'll be doing most healing as the master (SCH) and the fairy would be topping up Inbetween and buffing with whatever kit they have available. This pet system is having some changes come the new expac so most of the advice could be short lived anyway.