Hi alaina120,
Thanks for reaching out! We rely on our Music library as well, and understand you're running into some problems with downloaded songs being removed from your iPad. The good news is that we can help out.
When your iPad starts running low on storage, it may automatically remove downloaded content to increase available storage space. This helps prevent the iPad from running out of storage and shutting down or restarting unexpectedly. We have more information available about that here: How to check the storage on your iPhone, iPad, and iPod touch
When you get a chance, can you let us know how much storage space is available on the iPad? You can find this in Settings > General > About on the iPad itself. This information will help us better determine the next steps.
All the best.