I believe the way this works is this:
Since in the calculation above, you took the Family coverage for those three months, your spouse cannot.
However, your spouse did have Self-only coverage on December 1st, so she qualified for the full annual amount for a Self-only policy, or $3,550.
If she contributed $1,350 to her HSA, then she can leave that in her HSA and still contribute the $2,200 of your excess to her HSA (be sure to tell the HSA administrator that the contribution is for 2020!). Remember that both of you can contribute to either HSA.
Because the two HSAs are totally separate (it would like you two having IRAs - they are both separate), the HSA administrator can't do this except by sending your excess back to you and then you sending part of your excess to your spouse's HSA.
Make sense?
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