Why is Sri Suktam chanted for all three divine mothers Parvati, Lakshmi and Saraswati?

I wanted to chant a hymn for Bala Tripura Sundari and was advised to chant Sri Suktam which is dedicated to Goddess Lakshmi. Even the Shodashopachara Puja for Bala Tripura Sundari is intertwined with Sri Suktam even though the deity is Parvati incarnate and not a Lakshmi incarnate. Would like to understand more.