Books of this sort are interesting but too doctrinaire and selective to be convincing ... surely to the level of assurance suggested. This is furthered by the author -- again not unique to her -- questionable use of history, often ignoring troubling matters that would make her conclusions harder to reach. Thus, even if you respect her argument of libertarian views based on individual sovereignty (I do), how she gets there and how she applies it leaves something to be desired.
A few examples. As is typical of the genre, at least of those favored by the blurbs on the back of the book, the author argues recent courts have 'invented' things to fit the Constitution into what they feel is necessary for society. Interesting. After all, the author opposes Justice John Marshall's (who was at the founding) rejection of applying the Bill of Rights to the states in 1833 (before the 14th Amendment). One can also cite the Slaughterhouse Cases. That was 1873. And, a myriad others before the New Deal. As some note, pre-New Deal cases quite often upheld regulations. The 'Lochner Court' stereotype, notwithstanding.
Or, in general, all the liberty violations upheld in the past by the courts (no sending contraceptives thru the mail, various sexual practices, prohibtion laws [the fact a few did not doesn't suggest 'original understanding' which she claims is a primary drive of her jurisprudence] etc. One might also note times have changed -- there weren't even any police forces back in 1789. Modern society requires more laws (though citations of spitting on the sidewalk as an issue, is that not a public nuisance, is curious); but in many ways we are more free than we were in the past.
This is so even if general principles, though not how they were often applied, might be interpreted differently. She cites Burke ... but he was a conservative who supported many repressive laws on tradition grounds. Selective use of his statements mislead. Likewise, her balancing of state interest at times is rather brief (esp. latter chapters ... the one on illegal drugs are almost conclusionary; the body of the book is under 200pg) and a bit dubious. For instance, as to motorcycle helmets and public health costs, she notes the state generally doesn't pay. What if it did? [Her later book on life/death issues underline the complexities -- she raises some red flags regarding not protecting at risk people, the book on this one topic longer than this summary of many.]
The book does have benefits, if we admit to such problems, suggesting that off the top claims and a bit more modesty is often useful in such works. The fact a 'living constitution' approach can use a work of this nature is a bit ironic, but so it goes. I'd add a recent book by Daniel Farber on the Ninth Amendment was also pretty brief, providing some interesting arguments, but not enough depth at times. A good companion volume.