Dpofirs Cordless Phone, 4G LTE 2.4G WiFi Landline Phone with 2.4 Inch Color Screen for Dect VoIP, Support SIP SIM Card, Portable Desktop Telephone for Business Home

Does she have internet at home? Then I would probably get her a SIP Phone with a callcentric plan.If not, you could use something like this but they have no reviewshttps://amazon.com/dp/B0F99N6MS6