I've got a mallsai (bear with me, I know what I got myself into), and recently it's had a few problems. It's got what seems to be a white mold on the base of the trunk and the surrounding soil, and it's been, well, falling apart a bit. My best guess is root rot? It was my mistake, left it with a friend for 4 months while I was in Europe, and he didn't give it any sun or add more fertilizer. So my question is, should I maybe try to re-pot it before it's winter and hopefully the better soil will help (I've never re-potted it, got it last summer), or should I just sit back and see if it lives. I know mallsai are really cheap anyway, but it has sentimental value and I want to try to keep it alive.
Also, is it possible to grow a new one from the cuttings or is the tree too small? Its about 4 inches in height.
Here's an album of the mold and etc.: https://m.imgur.com/a/1OpUO