I think its due a moult as it hasn't since I had it. I just very lightly misted near it and it never moved. I know they go off food before moult but I'v never seen a T go completly motionless before it goes on its back.
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Some of my spiders are for sale....Have a look in the drop box and PM me for details
Keep her well misted, or just soak one corner of the container to boost humidity. Put her lower down so she's a bit cooler.. The heat kills any Megaphobema sp. My M. mesomelas is kept at about 65F!