 When Aurora was killed, the power of the Summer Lady was supposed to flow into the nearest Vessel of Summer, which was Lily due to the fact that Aurora designated her as the Summer Knight.She has befriended Harry.However, despite their longtime friendship, she is still bound by the rules of the Fae (along with whatever Geas Titania puts on her) and Harry struggles to get her to do things for him or give him information often against the best interests of the Fae.