I have some good results with Colette2 despite too few games (5-6).
Yes, she is a bit more fragile than Colette1 but you can play her to avoid bad match-ups like Justice2 or Tara (as you said) but also as Now You See Me isn't a Trigger, she is a good pick versus Ten Thunders (Masked Agent Upgrade) or models that disable Resistance Triggers (Executioner for example).
Colette1 needs her Keyword more than Colette2 to unbury where she exactly needs (without relying only on her Scheme Markers) and for Presto Chango. Colette2 can be played without her Keyword.
Concerning Decoy Markers, I use them defensively and use the Doves to Interact where needed. I think I would avoid playing Colette2 versus gunlines that can kill the Doves from afar. But hiding the Doves until the ennemy crew is engaged in melee is a solution.
You can play more melee beaters to engage ennemy models and Colette stays hidden in the back and interacts via Doves.
The best Strategies for Colette2 are Symbols of Authority (where the Doves can reach easily Markers in narrow spaces) and Turf War where the Doves can be used to make far away Strategy Markers friendly.
It also permits to use less models for some Schemes like Spread Them Out or Breakthrough.
In a game versus Lynch2, the Doves scored me 2 VP for Symbols and 2 VP for Spread Them Out.
Colette1 is better in Corrupted Ley Lines (Sword Trick being so useful to bury the ennemy Lodestone carrier) and in Break the Line where you only really need Don't Mind Me on all your models, Doves will be killed too easily as the majority of ennemy models will be near the centerline.
So, I need to test Colette2 more but I thknk that she complements well Colette1 by countering bad match-ups and playing differently some Strategies and Schemes. But she also is more unforgiving than Colette1 as she is more fragile. So she has a role but she doesn't outshines Colette1 (as some other Masters do) which is the goal of Titles, IMHO.
But, you can also only play Colette1 and have good results. Perhaps also a matter of personal playstyle.