As someone who has played this game for 2+ year and seen countless "OH NO!! He/she is OP!!!" threads I came to talk some sense into this thread.
So I play tested Holdo (at 3* and g8) in a fairly weak Resistance team in various nodes of GW. Often retreating to try the same node without Holdo or even Resistance (just to give me some sort of basis for comparison). They dominated. Every time. Without JTRey or R2.
I also intentionally attempted the "Bonus Tier" of her event with a "subpar" Resistance team (i.e. no R2, no JTRey - just Finn, a g8, poorly modded, not even maxed BB-8, a g10 Poe and ScavRey). They completed the Bonus Tier without any losses and all at full health and protection. Again, keep in mind, this is hardly a max team and didn't have JTRey or R2.
Holdo's kit looks solid on paper. AoE daze and a heal/cleanse combo than even in a hybrid team, would be decent. In the natural Resistance team with a JTRey lead and maxed BB-8/R2 combination, it's going to be ridiculous. Welcome to the Resistance meta everyone.
Whales, break open your wallets. While I tried to find weaknesses in her kit (and specifically, when she is placed in a Resistance team) all I found were hidden strengths, synergies that pile on top of one other and a character that, when placed in the already meta JTRey lead team will simply wipe out virtually any other challengers.
Sorry - I was hoping to talk some experienced sense into this thread, but as a long-time player, she might actually be the most OP character I have seen. And I own CLS and Raid Han - maxed.