Where is it written that the two state numbers must add up to (at least close to) the federal amount?  California requires reporting of nonresident income earned for services performed in California.  Did she received a 2020 bonus based on 2019 work, after she moved to Georgia?  Did she not return to California and work there some of the time after the move?  (Seems likely that she would have stayed away from her family all the time.)  

I hope they had a prenuptial so you don't have to worry about community-property issues.