Thank you to those who replied off-list.  I've received two very different views of the meaning of 

 jāgrat-kūrma-samśritā in the verse which I've summarized below.

VIEW 1

     The Bhagavadgītā uses the example of Kūrma for a state of the complete withdrawal of the senses:

yadā saṃharate cāyaṃ kūrmo' ṅgānīva sarvaśaḥ /

indriyāṇīndriyārthebhyas tasya prajñā pratiṣṭhitā // 2.58//

     Such a state would contrast with the state referred to by the word jāgrat.  Thus, it seems refer to the state of focusing inward.  I am not quite sure if you would call it sleep, or more likely a conscious concentration that directs awareness inwards.

Perhaps it means "she who abides in both the waking state and the state of complete withdrawal of senses."

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VIEW 2

I think that kūrma here refers to the microcosmic equivalent of the tortoise that supports the world. I V know of any clear references to this idea in texts, but one often sees Kuṇḍalinī supported by a tortoise in “cakra scrolls” from the 17th century onwards. See the attached image for an example.

That still leaves jāgrat, which seems odd here. One would want it to contrast with nidritā, i.e. to make a distinction between Kuṇḍalinī when asleep and awake, but that would require jāgratī. So I think one has to understand the compound as meaning “situated on a waking tortoise”.

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Thanks,

Harry Spier