As one of Lex's opponents, remember that if you kill Lex he will spawn with you as his target. you will also be at a streak of at least one with will give Lex an incentive to get revenge for more credits.
Ash's main strengths are her high HP and her Knockback abilities. Pips Ult can take that away from you for 4 Seconds. If he Picks up Moral Boost, resilience might be a good choice as you normally have high HP and Damage Immunity with her Ult.
Ash becomes Damage Immune but not CC Immune when she uses her ultimate. Your Evil Mojo will make her be unable to knock back/chip at your team, and if she is low HP be unable to be reliably healed as she returns to the HP she had before Evil Mojo