My beautiful Chilean Rose named Danica :D 
 
Anyway, i realised she was preparing for a molt (when an immature arachnid sheds its exoskeleton to allow growth). Basically what they do is lay a web "molting mat" and stop eating for a period of time before it (the amount of time varies greatly, ive had some fast for a few week, others a few months). 
 
I woke up in the morning and noticed that she was pretty much flat on her back. Inexperienced arachnid owners could be fooled into thinking that they're dead as they look, well, dead. But if you look close enough you will see slight movement in their legs.