what kind of soil did you use? Whatever it was I'd probably NOT use it again.

It looks like massive overfert or pretty high ph just burned the plant up.....but almost too quick even for that......possibly a root rot or disease or so got ahold of your plant. But without being able to check ph you're not going to be able to do much.....Distilled or RO or whatever also has to be ph checked first....ANY water should be so you may as well stick with whatever you are using already water wise.

She looks pretty toasted, i'm sorry. If you've flushed her thoroughly and can't check ph then all you can do is wait and see.

Good luck.