Yes, she would qualify to contribute to the HSA in this case.
The qualification is actually for whether or not she can contribute to an HSA. She evidently already has the HSA (once you fund the HSA, you have it until you close it), so it's just a question of when she can contribute to it.
As noted, the "last-moth rule" (whether or not she had HDHP coverage on December 1st and no conflicting coverage on December 1st) does allow her to use the full annual HSA contribution limit (one presumes for Self-Only); however, there is a caveat - she must stay under HDHP coverage for all of the following year (2023). If she loses HDHP coverage - or gets conflicting coverage - then the annual HSA contribution limit for this year gets recalculated and she may have to pay tax on what her HSA contributions should have been.
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