How Did irina spasky die in book 6?

Dan and Amy were in a house on an island with Alistair Oh. The house suddenly burned. Amy, Alistair and Dan went up the roof. Irina Spasky came from out of nowhere bringing a bamboo stick. Dan, Amy and Alistair slid through the bamboo. Irina pushed away the fire with the bamboo. Half of the roof collapsed. Then Irina thought of all the memories she had and looked up. She wanted her last sight to be the stars. Isabel Kabra actually secretly burned the house to steal the poem.