There is a rather interesting article from the Guido Fawkes website about a article that was supposed to be printed in The Telegraph in July last year but was apparently pulled after pressure from her supporters (HERE). It is in fact surprisingly critical of her and her time as Home Secretary.
She is described by David Laws as "secretive, rigid, controlling, even vengeful minister, so unpleasant to colleagues that a dread of meetings with her was something that cabinet members from both parties could bond over". It confirms what one of her constituents wrote in The New European some time ago - she is apparently not a very nice person at all.