Can Wisp Heal Eidolon Lures?

Not really. She can't heal the lures, can't prevent magnetic procs and the fire rate isn't particularly useful considering how easy it is to 1 or 2-shot the limbs.

Is wisp good for Eidolon?

Eidolon hunting with [Wisp] is possible. She's a versatile frame that can act as a support but also as the main DPS against the Eidolons. ... When you have to shoot the Eidolon just use Breach Surge to teleport to one of your motes, increasing your Critical Chance while doing it.

What are Eidolon lures used for?

They are used as a defense to distract and trap Eidolon Vomvalysts wandering near the camps, as the Grineer's conventional firepower proves otherwise useless against Sentients.