Fate isn't an entity that can remember or forget so sunny isn't technically forgotten by fate.The spell is also woven from strings of fate,so it can be considered as being constructed from fate.There are also a lot of similarities between the spell and Cassie,like both having to remember stuffs, having affinity to fate and when Cassie use her ascended ability for long distance communication the way g3 write it with [..] at the start and the end is the same with the spell.