Did she also change her account country?
In fact I am surprised you can change your country at all without encountering issues with the Family Sharing group. Apple specifically states that all family members must have their accounts set to the same country or region.
Legal - Apple Media Services - Apple
"All Family members must share the same Home Country."
Share purchases with others in your Family Sharing group
Share purchases with others in your Family Sharing group on Mac - Apple Support
"To share purchases, family members must be in the same iTunes Store country or region."
Check this link here for more details: Change Purchase Sharing settings in Family Sharing on Mac --> Change Purchase Sharing settings in Family Sharing on Mac - Apple Support
- "Note: To share purchases, family members must be in the same Apple ID country or region. If a family member changes their Apple ID country or region, that person might lose access to other family members’ purchases, and installed apps that were shared from other family members might not work. See the Apple Support article Change your Apple ID country or region - Apple Support