Erica and Boyd are held hostage by the Alpha Pack in the abandoned Beacon Hills First National bank being locked inside the vault in the months that follow.

 

One day, Erica talks to Boyd that there's a lunar eclipse coming up. She wonders what that might be like for them. She morosely wonders if it will make them stronger. 

 

She looks up at the Alpha Kali who was keeping watch over them. She fiercely says "I hope it does". She shapeshifts and takes on Kali. The Alpha is too much for her and she loses. Erica falls to the floor of the vault. In her final moments, she reaches for Boyd's hand, gasping her friend's name: "Boyd", and dies.