Theres a story in the Spinal Decompression section of
Relax Into Stretch where Pavel tells a story about a police officer or something that would hand from a pullup bar as long as he could with his wife hanging on his legs to lengthen his spine, and at the end of the year he had grown taller. You could also just try Spinal Decompression.
I dunno if this'll actually work or how long it'll take to work but she could give it a shot
