I have grown three caeasalpinias from seed and gave one in a pot to my sister about 3 weeks ago.Today I was horrified to see the lack of progress in her plant and suggested I check the roots- there aren't any except a few brown rotten ones and the plant was very overwatered. I have downsized the pot and re-planted into fresh gritty soil and placed it on a heated undersoil area .Do you think it's mission impossible or may it recover? Thanks for any suggestions.

Hazel.