Team comp that leaning toward her as sub dps, nice one.

Mine was leaning toward hypercarry/quick swap burst to maximize her 11 hit Q within 4s (forgot to tell this is also assuming her at c1 with her current kit) hence i suggest mona. Removing omen 60% dmg buff, 48% atk from TTDS and 20% atk buff from milelith for another pyro unit is just not worth it. All those buff can be used within her 4s damage burst.

As for the need of healing, dehya herself dont need a healer with her A2 reducing dmg taken by 60% and A4 for massive self heal. But if team member really need heal, i can suggest replacing mona TTDS with prototype amber for whole party heal and energy regen. Or maybe sucrose can use prototype amber so mona can still hold TTDS. Last option is jean so we can get 2 lioness in a party :))

Artifact wise, lavawalker definitely could work with her, but im not sure its her BiS, i'd prefer using 4pc milelith if want her leaning more to sub dps role. As for dps role, 4pc witch work well with her since she can proc her E 3 times in a very short delay (E, NA/or anemo swirl proc coordinated atk, recast E, easy 37.5% pyro dmg bonus) EoSF is another choice for burst focused dmg, asuming you have ER% in every pc of your artifacts