I appreciate the write up and respect your point of view, but all of these scenarios sound incredibly niche.
Is turning the bow into a double action weapon to make it "usable" really that good?
Sights aren't on their house list. You're going to need to get one from the trading post after the first game. Which is fine. However, having a "dead model" for that first game really hurts (I experience that with psy-gheists a lot

).
She's an investment:
- a bit too expensive to use as chaff like you can with little sisters
- a bit too weak to really ramp up the Xp gains like you can with a leader, champion, or specialist.
I also think Wyld Runners being Strength 2 really limits their melee options to toxin only. Don't get me wrong toxin weapons are good and Escher's thing, but it limits their ability to grow without spending Xp to level their Strength back up to average. At that point (outside of the cats) a Little Sister does their job better.
I think the blaze arrows are ok.
I think the poison arrows are ok.
The explosive arrows have unstable, so that's generally a pass from me.
The -1 at long range (which is mid-range in the grand scheme of things) makes it difficult to see her as a "sniper".
I think it's too expensive Xp wise to turn her into a melee monster. You'd need Attack, Weapon skill, and maybe even Strength upgrades on top of upgrades like Toughness and Wounds.
I think she's a decent model at close range (1-9").
Personally, when I run one, I run her with the bow and the cats--move in to shoot at close range, then charge the cats to finish the job. I spend xp on Ballistic skill, Toughness, and Wounds. If she makes it to a champion, then she gets the bigger cats

.
Insert Family Guy meme of Adam West with his cat launcher crossbow, or the crazy cat lady from The Simpsons.
I like the lore, I like the model, and I like the beast master vibe they have. However, it's just really expensive to get them to where they need to be.