question about unknown status buddy

[. S .]

Hi there,
 
Normally when I log in tot Pidgin I get to see the status of all my buddies. How ever, since today this has changed for one specific buddy (she is a gmail/google talk buddy). 
Instead of showing the status, like offline/online, it says "no permission" and at the right side it shows the icon no permission (red circle with a red diagonal line).
I don't have this problem with other gmail/google talk buddies, only this buddy.
 
Could you please let me know what this means exactly?
 
 
Many thanks! 		 	   		  
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