Colette is a really strong Master, but she also benefits greatly from having a good selection of models to work with. That said, she can still be quite competitive with only a few additions to her main crew box, such as Coryphee, the Sabertooth Cerberus, December's Acolytes, and Malifaux Raptors.
For GG2016, she works well in Headhunter, Interference, and Claim the Bounty, in that order from most well-suited to worst. She can still score for Extraction and Guard the Stash, but a lack of default durability will make things a bit harder for her. Schemes are a bit more complicated, of course.
Easier (will probably score 1-3 points):
Convict Labor, Exhaust Their Forces, Leave Your Mark, Covert Breakthrough, Undercover Entourage, Catch And Release, Frame For Murder, Detonate The Charges, Set Up, Search The Ruins, Public Demonstration, Occupy Their Turf
Colette and crew do a lot with movement and interaction. They can put the right things in the right places at the right time, whether that's models or markers, so long as they're friendly. Scheme markers are a particular forte of the Showgirls, and Colette makes it even easier than most Masters to put them down.
Maybe Easy, Maybe Hard:
Hunting Party, Show Of Force, Neutralize The Leader, Mark For Death, Inspection, A Quick Murder
These really depends on what you intend to buy to work with Colette. If you pick up Howard Langston, the Cerberus, or another Arcanist damage dealer, some of these become almost trivial (Hunting Party, Neutralize the Leader, Mark for Death, and A Quick Murder, notably). Arcanists have good generic upgrades and a good Enforcer/Henchman pool, so Show of Force isn't an automatic loser, but Colette tends to give more advantages to Minions or Showgirls. Inspection is a little swingy and can go either way, although that's really the case with almost any Master, and isn't unique to Colette.
You're Probably Gonna Have a Bad Time:
Take Prisoner
I know I said above that durability is a factor, but this is really only the case for everything else in Colette's box. Colette herself is really, really hard to actually remove from the board, and savvy opponents will take advantage of that. Colette makes her Crew good at this scheme herself, but you could very likely end up trading points on it.