Specific spots of leaf drop

Here’s an interesting specimen. She got a bit over defoliated before going into flower. She flowered early and I thought I had another week or two of veg. She’s stacking nicely because of it but two problems. She’s much lighter green than any of the others(even her twin sister clone). In fact. All others are nice dark green. And she’s specifically dropping leaves in one area. Thoughts? ️

-Stay Humble