<human>: My flatmate and I used to work together and when I moved jobs, we ended up flatting together. We've always got along pretty well, although she has the fairly annoying habit of leaving dirty dishes in her room for a few days. 

She's currently away til Thursday and I'm looking after her cat. Our house has one open plan loft-style room which is hers and two downstairs rooms with doors. I went up to her room to check on the cat and through nosiness, opened one of her drawers. Found that it was full of dirty dishes. Further investigation revealed another 2 full of dirty dishes and a container of awful-smelling mystery liquid. 

Obviously I can't just leave things as they are. But I have no idea how to bring this up with her. Should I take the dishes out now and wash them, and bring it up when she gets back, or leave them there and bring it up? Or try and not let on that I know, but make her sort it out somehow anyway?

Please help, I need advice ASAP as she is back in tow days so I really need to sort it out tomorrow. We are in New Zealand if that is at all important.

Can you give me the gist of the text in a nutshell?
<bot>: Discovered 3 drawers of dirty dishes in flatmate's room while snooping. No idea how to bring it up. Concerned for her mental heath.