I think your therapist is wrong, and doesn’t understand the enormity of the loss.

Have you ever read any of Hope Edelman’s books? I imagine you might have- she lost her mother at a young age, and has spoken to probably thousands of other people who have, and the major theme of her work is that the loss never goes away, and can have a profound impact on the rest of your life.

I’m sorry but your therapist should really try to educate herself- I would be very angry if someone tried to tell me that all I needed to do is “go through all the stages of grief” and then all the pain of that loss would be erased. It just shows no understanding at all. Perhaps you might make some reading recommendations to her?

(As an aside, I have a friend who is a therapist- she told me after she lost her mother that she actually felt quite foolish and embarrassed about how inadequate her response had been with her grieving clients.)