I am not a Harpist but I do play other furniture type instruments and a I'd tell her to let the strings down a bit. I wouldn't disassemble the harp. Some harps have removeable pillars and arms..
Where is it twisting, in the chamber of the harp or in the pillar/arm. Is it too dry and is it coming apart because of glue failure? maybe we can troubleshoot this for you and get it on the road to recovery. Is it wire strung or is it gut strung. (I built a small bardic type harp once and used weed eater chord on it. Sounded good.)