Issues prevailing for weeks. Leaves dying. Why does she hate her life!?! :(

The issues your plant is experiencing are likely due to nutrient imbalance or lockout caused by infrequent watering to runoff and potential overfertilization. While springtails are present, they are not likely the cause of the damage. Here’s what you should do: Flush the soil to remove excess nutrients and salts. Water until runoff regularly to prevent nutrient build-up. Adjust your feeding regimen to avoid overfertilization. Manage soil moisture to control springtail populations and improve root health. By following these steps, you should see an improvement in your plant’s health. Keep a close eye on new growth to ensure the problem is resolving. Good luck!

does look like some calcium issues to me. The good news is that the new growth on the zoomed out pics looks healthy, and the old growth that is damaged will no repair but it will stop progressing further. I would also be suspicious if you have over feed them a bit or are watering to much. Best to link a dairy to the question so other can look into it and see if they find anything with the data posted.