For her FBAR/FinCEN114 I would go ahead and start using her newly assigned Social Security number. When you notify the IRS they link the accounts and that should also eventually catch up in the FBAR system.
If for some reason the FBAR is rejected this year, then use the ITIN one last time since there could be some bit of a lag.
There should be no need to specifically inform Georgia of the change, just add the Social Security number to your return when you file. If they have a question, they will reach out and you can then explain.
This is a relatively common occurrence and while they all just look like random numbers to most of us, the IRS and other authorities can tell which are ITINS and which are SSNs and when they see a switch from one to the other, they usually understand without asking what has happened.
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