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
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.
If you can see and kill Ying, Prioritize her over her Illusions. Killing Ying makes her Illusions despawn and prevents her from Healing/Shattering. If you can't see Ying and have no/low cauterize killing Illusions might stop healing from her.
Ying is limited to 2 stationary Illusions. If Ying wants to push up she needs to sacrifice illusions to make new ones to heal or her team will need to fall back for healing. Killing her or her Illusions gives no healing for the enemies to retreat to.
Ying's Ultimate ability, Illusory Rift, heals but can let her use her Dimensional Link to teleport to her team. If Ying uses this right after respawning, look out for her teleporting to her team and kill her to waste the Ultimate.