yes, she is great with poison comps for hydra and clan boss. Just build her for survival and accuracy with speed. I personally run her in 2 piece ACC with speed boots and speed set, focusing on primary HP% Chest, DEF % Gloves, ACC Banner. Other good options are relentless set with speed if you can hit 230 ACC with the gear. The longer she can keep that poison sensitivity up, and herself, the better. 

It depends a lot on your account. Frozen banshee is not that great unless she is running at high speed, with counterattack, or some other mechanic that lets her apply more poisons.

Where are you at with your clan boss team? If you post your roster, we can give more specific advice.

Frozen Banshee is great for Clan Boss and Dragon, at the very least early to mid game. Personally I'd recommend building her as being able to farm clan boss should be a priority.

This is the right answer.

FB is good, yes, but she isn't *amazing* by any extent, and, without CA/AA, she is far less impressive than just about anyone else who can place poisons.

This is my current Clanboss Team: 

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I am able to get roughly 10k damage on Brutal currently.  I am looking for ways/champs to help improve, and have tested several, but keep coming back to this group as it gets the most damage done.  I am thinking right now my focus should be on slowing the clan boss, weakening him somehow, but I don't have many options for that.  I do have Delver (she has Decrease Def, Weaken, etc) but I haven't built her at all, and I don't think based on %'s she is reliable.  Klodd is fully booked, so is Apothecary, so for now I am running Klodd.  

Skimfos has a slow, but its unreliable (35%), I've even considered trying Armiger in place of Warmaiden, but he's not 60 yet.  

There's a lot to unpack with regards to CB. I'd highly recommend you read up on some guides, such as those on HellHades or Deadwoodjedi.

You're likely still too early in the game to be too concerned with CB, but for your starter team you probably will be okay with something along the lines of Artak, Vogoth, Aniri, Kael, and Frozen Banshee. Don't worry too much about tuning for now. Just make sure all five have Warmaster. Also, if you can find a soul for Artak, getting Brimstone for him will help a bunch.

Thanks for your input!  I really appreciate it.  

Aniri doesnt have any books yet, so working on her.  As for banshee, When I swapped her out with Warmaiden, my damage went down each match.  I am using Klodd for speed, accuracy, and shields, which helps me last longer.  Once I get Aniri up I plan on adjusting more.  

Last two, swapping out Warmaiden for Banshee.  I'll keep tweaking, and once Banshee is higher level and better geared, probably do more damage.  

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