One Half Support rules for year of immigration to US

What are the rules for determining 1/2 support for this situation?  An individual immigrated to the US (green card) on 7/28/24 from a country with a much different economic model.. she supported herself in her home country (prior to 7/28/24) but will be supported 100% by her son in the US.  (Very complicated to compare costs because of the currency and cost structure differences.)  Can you legitimately break it down as a monthly test and determine that her son did NOT provide 1/2 support for 2024? (That would be the better outcome in this case, btw.) Please share whatever references you have so I can retain it in the tax backup. Thank you!