Heirloom Boston Fern Decline After Altitude Change

A 22-year-old wedding fern declines after moving from 10,000 ft to 5,400 ft in Colorado. Shedding leaves despite usual care. Expert Darlene: likely never repotted—roots fill pot, little soil to hold water. Fern dying of thirst. Soak in sink/tub. Spring: divide into two pots with fresh soil. Move to less sunny spot (SW corner may be too bright). Miracle-Gro half-strength biweekly (skip Jan/Feb). Repot in April.