93 g is not that big, so can't imagine that you should have a problem. You, and your gf,... haha,... could try jumping on that spot to see if there is any movement...
Don't know if you can tell, but it depends also which way the joists run underneath. If they are perpendicular to the wall, the load would be spread over at least a couple joists, and there would be a very short moment arm (from the wall) as compared to the middle of the floor or an unsupported area of the joists.
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