if Meg didn't need to concern herself with the details of a ~$11bn deal because HP
Meg had nothing to do with this deal, this was made before her time. She had to oversee the writedown.
Leo Apotheker was the CEO of HP, and the driver behind this deal.
As per a wikipedia quote I have provided before on this topic:
During Apotheker's tenure at HP the stock dropped about 40%. It dropped nearly 25% on 19 August 2011, after HP announced a number of seemingly abrupt strategic decisions: to discontinue its webOS device business (mobile phones and tablet computers), to begin planning to divest its personal computer division, and to acquire British software firm Autonomy for a significant premium. Over the months following Apotheker's departure, HP eventually spun off the remaining webOS assets into a new subsidiary, Gram; backtracked on any plans to spin-off its personal computer division; and wrote-down almost $9 billion related to the Autonomy acquisition, which it indicated was due to a lack of due diligence during the acquisition process under Apotheker.
Though Apotheker served barely ten months, he received over $13 million in compensation: a severance payment of $7.2 million, shares worth $3.56 million, and a performance bonus of $2.4 million, although the company lost more than $30 billion in market capitalization during his tenure.