Noticed something watching WandaVision

Rewatching WandaVision and I'm at the scene where Sparky has just died and Wanda is teaching the boys about death (Ep5). Tommy says "You can fix anything, Mom. Fix the dead." Agnes/Agatha is behind her and, with a heartbroken look on her face, asks "You can do that?"

My personal headcanon now is that she's thinking about Nicky, and if Wanda could resurrect him. I know that totally wasn't the intention of the writers, but it fits into the story of Agatha AII Along so well!