You rotted the roots - so you can cut the root system off and up the stem to the clean tissue, remove the bloomstalks and wilted leaves and reroot it. You can start rerooting it in water right now - and plant it to the soil later - because the root rot is working up the stem now. You need to do the surgery now.

The info you can use on how to root the crown should be on this site.

My advice is to read whatever you can find on this site - it is a treasure trough of lovingly put pics and explanations on AV culture.

Good Luck

Irina

Here is a link that might be useful: Rachel's Reflections