Yareli doesnt have any support outside of CC, she is heavily self-centred and focused on being tanky Secondary gun platform.
You may try to go for High Range build with swapping the 3rd ability for Helminth utility ability - Silence, Petrify, Wyrd Scyphes, Pull, Resonator or Breach Surge for even more CC; Fractured Blast, Nourish, Dispensary or Augmented Spectrorage for energy support; Tharros Strike or Terrify for Armor Strip; Augmented Tempest Barrage for Viral+Corrossive AoE Priming; Quiver for invisibility; Nourish, Roar and Augmented Thermal Sudner, Smite and Shock for team damage buffing.
Just mind that using Helminth forces you to dance on and off around Merulina or using the Loyal Merulina Augment.
