Vanellope 180 R9
Stats
Armor - 100824
Reality - 91772
Reality Negation - 91
Normal Crit - 259
Fantastic Crit - 243
Crit Damage - 279
Evasion - 231
Her Fan Crit is quite good & to crit attack, you need +37 & her damage is fantastic so the First & Second Mod should be BD Mod with Fantastic Crit Upgrade If you want a 100% chance of critical strike else to go with one BD Mod with +32, you will have 95% chance of a critical strike.
Now, her green skill does damage & also slows down attack & movement speed by 25%, also by giving skill power mod will also increase damage from white skill. The better choice is skill power mods with green skill upgrade but they are hard to come by, so I will give another suggestion also.
Mod Matrix
Vanellope - If you have resources
This will have a 36% chance of critical strike, you can also give 3 Green Skill Power Mods & one BD Mod +32 is required.
Vanellope - If you fewer resources as green skill are hard to come by