As I recall, Berna is missing her AW passive that lets her auto-withdraw any other rogues on death while she's on the field. Clissa also has a buff, I think. So we'll probably get those, at least.
her passive already in effect and berna don´t need stay in field
to save other rouges ass
mmm i just check it and it don´t activate T_T but in last event i have used betty and berna to slow and die with the mummys to get the 3 stars at undead swarm