You've a nest of something. To find your lil drop-ins in suggest you lay stickies of some sort (although outdoors you'll have to get creative)
But, to find the fault. You got find the culprits.
Most likely. They're night attackers. As if it is past related that much damage. You'd see something
Traps, plants/dishes of soap water around, place growth around them. Hopefully you'll catch a few. Just an idea.
Good luck. Hope you solve this. She can't take much more of this. As them leaves are well, let's say, not going at full steam.