My sister has a yucca that is wilting badly and most of the stalks have broken off. She repotted it last year in quite a big pot and it has gotten worse since then, so she's given it to me to try and revive. The main trunk is still quite hard, so I don't think it's rotting but the wilting seems to gradually be getting worse. It is still growing new leaves though. Would it help to repot it into a smaller pot? I have it in the window next to my Yucca, which was bought at the same time and is about five times the size now of the wilting one. I would very much like to save it if I can. Can you give me some advice please?