If you can access from different devices it most likely means a cache or cookie error. Or, it might be that you are accessing the editor from a different internet connection. Perhaps she is using cellular data for both?
I suggest first trying with your computer using a different browser in private or incognito mode. If that doesn't work, try connecting to a different internet source. Once you pinpoint the problem you can take the next steps to resolve the original issue. Clear cache and cookies and/or reach out to your internet service provider for additional troubleshooting steps.
