VPN
If they allow VPNs, install a VPN client on the iPad and connect it to to the VPN provider’s network before launching the Plex app.
Mobile Network
If you’ve a generous mobile plan, bypass the WiFi network and use the mobile network. You could use a phone as a hotspot.
Change Remote Access Ports
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Find out if they’re blocking 32400. Try to login directly to your Plex server. In Safari on the iPad, go to http://pms_public_ip:32400/web and see if she can login. If she can, try using your server’s public IP address as the manual server address in the Plex iPad app.
Have her go to Open Port Check Tool - Test Port Forwarding on Your Router and enter the public IP address of your Plex Server (see Settings → Remote Access), and port 32400. This will test connectivity from her iPad.Edit: Never mind. That site tests from their server, not the iPad. -
If they’re blocking 32400, see if you can find an unblocked port and change your Plex server to use it. FWIW, I enabled the Plex server on my Nvidia Shield, configured it to use port 443, and was able to stream remotely to my Android phone on the mobile network.
Talk to IT
Ask their IT department to allow Plex. The worst they can do is say no.
