“This is Estella, Doctor Loris's assistant. I... snuck into the reactor to help Kelemen. But there's not enough time. The reactor is going to go critical. I'm dosing Kelemen with enough RadAway so he can finish fixing it, but... the radiation is going to get us. At least the Vault will be safe.”— Estella's holotape
A Mister Handy playing the role of an assistant to Doctor Loris, Estella rushed in to help Kelemen in the reactor wing. Sealed in with him, she used her supply of radiation drugs to keep him alive long enough to fix the reactor and save the vault - before perishing alongside him.