Not as much as?

The food supplies amazed her but did not reassure her as much as she might have thought: the Donner Party kept recurring to her, not with thoughts of cannibalism (with all this food it would indeed be a long time before they were reduced to such poor rations as each other), but with the reinforced idea that this was indeed a serious business: when snow fell, getting out of here would not be a matter of an hour's drive to Sidewinder but a major operation.

Hi. This quote is from the novel The Shining. Would you please tell me how I should understand the underlined part? Is it equal to the following two versions?

The food supplies amazed her but less reassured her than she might have thought...
OR The food supplies amazed her but did not so much reassured her as she might have thought...

Thank you.