@Absolute46
I'm sorry no one has answered before now.
On the pentas, keep looking for the munching culprit. It's just impossible to say what's eating them. As to the little mushrooms; it's no biggie, they are just an indication of decomposing plant material which is undoubtably the mulch. However, I see some leaf tips browning on the pentas so you might check & make sure that area isn't staying too wet especially if you have a automatic sprinkler system.
Armadillos...... PITA!!!! Yes, they WILL dig up your plants but not for the plants. They will dig to get bugs, earthworms, etc....if plants happen to be in the way - they end up being victims of the dig. Also, they are creatures of habit. If they are visiting your yard now, then they will continue to visit your yard. It's not as if they will move on to some other area.