Can anyone tell me what’s going on here?

What are you feeding her wipit?

Calcium is immobile, if it was Calcium it would show up on new growth first, your problems started with bottom leaves meaning it's mobile but has spread to entire plant. Magnesium on other hand is mobile, and forms the atomic core of chloryphyl, if magnesium supply was effected it would show as old growth first then as it depletes entirely the chloryphyl cannot be replenished without magnesium for the core. Too much calcium locks out magnesium. Foliar application is the fastest way to get nutrient Into a leaf. Put a little magnesium sulphate/Epsom Salts in a spray bottle and saturate some leaves, overnight it will either look better or the leaves will stay sick. Once again, no diary, no details. 80% of problems arise from improper environmental conditions that In turn leads to nute deficiency. Without a detailed feeding schedule and growing conditions. It's mostly just a guessing game. Hope you save her good luck.

Looks like you got some sort of calcium deficiency or lockout. Do you feed extra cal mag? Necessary in coco, more so coco+led. PH could also be too acidic to absorb calcium (should be 6.0-6.2) plants looking generally pale underfed. If you could give us more information we could give you better assistance, hard to tell what’s really going on with no dairy