(spoiler/speculation)
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c8 and c24 is enough to make me believe she isn't in kahoots with dive +h100 but rather was an original sunshine ent staff, mainly 'cause she:
- was the one who recruited jy and a lot of the staff on OG sunshine's side worry about him (c25, c27)
- also worries about the lighting all the time (c27, c32)
- was rightfully suspicious of sm but convinced by sugyeom to take the collab (and we know sugyeom knows jy's predicament so i assume yeju does too (ch8)
- doesn't particularly get along with baek cheolmin (jun's uncle) and even considers her team a separate side to them/OG dive (c20)
- collab is moving along so there's no known sabotaging. 10billion says dive's side is being fussy but it might be 'cause yeju is worried about jy? (can't remember the exact ch or scene lol)

I wonder if Director Han Yeju knows something about what happened in the past when she requested for the lighting to be brought down low. When she said, “…so he doesn’t come crashing down this time..,” do you think she was simply acknowledging that JY is sensitive to bright lights, or was she implying something deeper than that?