Hi lordspudz,
You may have (too) many apps open in the background on your iPad. If you haven't already, double-click the Home button to open the Multitasking view, then swipe up any open apps to completely exit them. If Songbook+ is still not running normally, my next step would be to restart the iPad.
All Songbook+ data is located in its App folder on the iPad. If the app works normally, you can share this folder and access it from the computer via WiFi. Whether you can access the Songbook+ app folder from the computer via USB cable depends on the iPad model and the iOS/iPad OS version used. Sometimes a program like "3uTools" can help.
If the problem persists, it would be good if you post here which iPad model you are using and which iOS/iPad OS version is installed. Maybe then you can be helped.
Best regards,
Chris