Things that you might wants to build:
HP, Block Proficiency, Meter Gain, since this enhances her ability to survive and deal a lot of damage.
Recommended PFs: Valentine, Eliza, Miss Fortune.
Recommended Rift Battle positions: Immunity, Regen, Armor and Biofeedback.
In general, you will want her as the first fighter of a team with someone who can respawn her if she gets KO'ed. A nice team for her is GI Jazz and General Surgeon, and she will do incredibly well with maxed meter gain, since her BBs will charge with the hits her teammates receive. And Big Band can take a lot of them.