I felt that. One time, I ran into a dude I took a welding class in college with working at a U-Haul and I had to look up at his degree hanging on the wall to remember his name.
It is like she did not want Twilight to remember her. Spike introduced himself, it would have been common courtesy for her to introduce herself to him.
Oh god I’ve been in situations like this. You just make sure to be very general in your greetings and farewells so that you don’t have to actually know the person’s name and they never catch on. (Introvert survival tip there)
Also, that is an amazing name for an ice-cream shop.
Spike? Is he the dragon or the orange background pony?
Edited
You assume this continuity matches the show continuity.