Umbridge's goal calling in Dementors

[Eustace_Scrubb]

No: HPFGUIDX 127142


Umbridge tells Harry when she's about to Crucio him in her office:

"'Somebody had to act', breathed Umbridge, as her wand came to rest
pointing directly at Harry's forehead. They were all bleating about
silencing you somehow - discrediting you - but I was the one who
actually did something about it... only you wriggled out of that one,
didn't you, Potter? Not today though, not now -' And taking a deep
breath, she cried, 'Cruc-' "(OoP, Chapter 32, "Out of the Fire")

Did she expect that the Dementors would successfully administer the
Kiss, thus eliminating this irritation permanently?  

Or as Senior Undersecretary to the Minister, was she aware that the
Potter boy had already survived at least one Kiss attempt from a swarm
of Dementors and was in fact capable of producing a corporeal Patronus
that would be sufficient to ward off two Dementors?  

If the latter was it a setup to provoke underage magic/magic performed
in front of a muggle and thus a charge that could at least get Harry
expelled and possibly sent to Azkaban?

Or was it "If the dementors don't get him the Wizengamot will?"

I suppose it doesn't make too much difference, except perhaps to
delineate the extent of Dolores' evil.

Cheers,

Eustace_Scrubb