Finally some free time after a long crapsack day, now time to throw some opinions for this twin-tailed girl.

Dendrobium... she's the old goddess of nuke in FKG back then and now she still one of the best sweeper in the game. Although she's not so unique anymore, she still one of very popular choice in my ally list. Now let's get started

1. Raw stat: Her stat are pretty low except HP which exceed 20k. Her atk, which is the most important for her character, is surprisingly low with 7500 only. Def is also low with 2800ish. Spd is okay with 530, easy to fit in any team without breaking composition or setup.
Grading: C
2. Skill: Slightly better than any average AOE type with 2.4x, the chance is 24-34% as usual. Potent power for sweeper.
Grading: B+
3. Abilities: She boost 22% atk on party and total 32% on self. Not too shabby but I do want some more for nuker like her. Her true worth shines in her skill activation combo however. The 100% to react on first turn and 2x chance to use skill made her spot as vanguard who clears all small flies first before any single target nuker can land attack on boss or stronger remaining enemy. But just like any nuke girls, her value decline sharply if cannot defeat enemy in single turn. It's a normal trade-off, not exactly a flaw or bad point. Fit her with correct composition and she will blow trough enemy's rank cleanly with potentially 4.8x on first turn.
Grading: A (If stand as team vanguard, otherwise just B)

Final verdict: Somewhere between B+ and A- It just kinda hanging around there. Her raw stat hold back so much of the potential she possesses. If only it reach at least 7800atk or her abilities boost damage from skill or even sharply increase atk like BB. Then solid A is a given. In a new, broken map it's become more common that Dendrobium cannot clear even fodder pests so some powerful boss killer skill might wasted on them rather than actal big prey. Maybe after she got rebuff she will reach pinnacle of A proudly. For now it just A from round up.