More Power to her - but what's she doing in Cashel?

It was in a second-hand bookshop in Cashel, County Tipperary, that I invested €2 in the purchase of '"A Problem from Hell", America and the Age of Genocide' by Samantha Power. It won the Pulitzer Prize in 2003.
It was only after I got back to the cafe that I saw that the book was actually signed by the author. Strange one.
And it's only now on lifting up the book that it dawns. Of course, that's the Samantha Power. Originally from Ireland. Was connected with Obama somehow and fell from grace because of some controversy.
And so the trawl begins.
That was 2008, when she called Hillary Clinton 'a monster' and had to step down as Obama's foreign policy adviser. Five years later, at 43, she became the youngest-ever US ambassador to the UN.

Would you lose your accent to fit in? To succeed?
http://www.irishcentral.com/news/samantha-power-recalls-her-irish-brogue-when-appointed-as-us-ambassador-to-un-210297361-237594511.html#

A Vanity Fair article suggests a trace of her Irish accent remains. And she can still tell a story -

She’s based in New York City with her husband and their two young children at the ambassador’s official residence in the Waldorf-Astoria hotel, which provoked an amusing story from her:
After she’d been ambassador for several months, her husband—a Harvard law professor with the uncommon name Cass Sunstein—grew a bit tired of the concierge calling him “Mr. Power.” “It happens, you know, when women are in jobs like this,” she said. “So my husband comes down one morning, and he finally says to him, ‘My name is Cass, but if you want to call me Mr. Sunstein, that’s also O.K.’ And the concierge shakes his head in amazement and says, ‘That’s incredible! You look exactly like Mr. Power.’ ”

Cass Sunstein is internationally-known in his own right, as someone comments after the Vanity Fair article -
http://www.vanityfair.com/politics/2014/08/samantha-power-un-ambassador-profile

The sad tale of Samantha's brilliant dad, and the question of emigration -
http://www.independent.ie/irish-news/samantha-power-the-triumph-and-sadness-of-emigration-26448778.html

More on her dad, who died in his forties, and a decent tv news piece in which it's hard to detect that trace of Irish brogue -
http://www.evoke.ie/evoke/irish-american-samantha-power-talks-about-father/

Kate O'Brien makes the odd appearance in this blog, and she pops up again here -
http://irishmedia.blogspot.ie/2011/08/samantha-power-and-sacred-heart-nuns.html

Having killed off one of writer Brian Moore's relations in an article, there's some sympathy for the author of one piece about Samantha - http://www.independent.ie/irish-news/apology-as-forbes-withdraws-homosexual-claim-about-president-michael-d-higgins-29443643.html

Turns out Samantha Power was in Dublin the day before she made that calamitous remark about Hillary http://www.ucd.ie/news/2008/03MAR08/120308_samantha_powe.html  Think she was on a book tour when she gave that interview to the Scotsman. Some scoop (although it seems she thought the remark was off the record).

See SP (yes, getting more familiar now) was born in Dungarvan, Waterford, in 1970. Got that from the movie site IMDb site.
Weird, see now she actually refers to herself as SP on her blog (which stopped in 2008) - http://samanthapower.blogspot.ie 
There's lots more. She got married in Kerry in 2008 and the wedding car was driven by her uncle from Cork.

But finally I just search for Samantha Power Cashel Tipperary bookshop.

I still don't know.