How did Umbridge know?

[Cathy Drolet]

No: HPFGUIDX 112911

Theotokos
>>In Ch. 22 "St. Mungo's Hospital for Magical Maladies and Injuries" Harry has just had the experience of being Nagini and seeing Mr. Weasley bitten.  The kids are now is DD office, Fawkes is keeping a "look out", and Phineas has gone to alert Sirius of the imminent arrival of the Weasley children and Harry.  In the American HB page 474:  
 
     There was a flash of flame in the very middle of the office, leaving behind a single golden feather that floated gently to the floor.
     "It is Fawkes's warning," said Dumbledore, catching the feather as it fell.  "She must know you're out of your beds....Minerva, go and head her off--tell her any story--"
 
I think it is agreed who the "she" is but how did she know?<<

DuffyPoo:
I'm not going to be able to help you at all with this question, but to add a similar situation. In PoA, the Gryffindors are partying because they beat Ravenclaw at Quidditch, putting them, I think, into the final when at one time they thought they would be out of it.  Professor McGonagall showed up and ended the party and insisted they all go to bed.  After Ron is attacked by Sirius, and everyone gets up again , Fred Weasley even suggesting that the party is carrying on, and McGonagall shows up again, quite indignant and telling Percy she expected better of him.  How did SHE know?

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