Kundalini references a spiritual or mystical experience that is generally thought to be a life-changing and disruptive "awakening" (although not necessarily the same as "enlightenment" or a full spiritual awakening). Useful information on this experience is difficult to come by, and this book does little to help.
From the opening chapters, Dale's coverage of the topic is riddled with factual, historical, and linguistic errors. It's hard to say for sure what might be true or untrue with regard to Kundalini itself, since first-hand experiences are rare and second-hand accounts are contradictory. But with regard to the historical roots and accounts of Kundalini in Vedic, Buddhist, and Tantric sources, Dale is mystifyingly ill-informed. Nor does she purport to offer any first-hand knowledge.
Additionally, the book is padded with paragraph upon paragraph of unnecessary, repetitive, and unhelpful verbiage. Whole chapters can be skipped for lack of anything substantive or actionable.
There are a smattering of practices, any of which can be found in a garden-variety book on yoga, meditation, or pranayama.
One bright point: Dale recognizes the tantric teachings relevant to Kundalini without lumping Tantra into a western better-sex program, or restricting sources to some particular orthodoxy of classical lineage. And as already noted, at least Dale does not pretend to first-hand knowledge she does not have.
Still, this book has little of substance to offer the serious practitioner cultivating Kundalini.