I have thoughts on this. If she is willing get online access to her card so you can see everything she charges. You can set up texts alerts so you are notified with every charge she makes. This lets you jump on any problem spending early. This is a tough one to stop. If you haven't already read my story about phone fraud here's a link. https://betterhumans.pub/a-drastic-but-effective-way-to-help-protect-your-aging-parent-from-fraud-4c5cef59489d