How would your OC react if Cyna suddenly became a little kid again?

Btw she still remembers her relationship with your OC, she just forgot other stuff >:3

For example, Spectral and Cyna didn't officially become siblings until Cyna was 10 or 11, but Cyna still recognizes Spectral as her older brother in this state. (Spectral by u/6HattieLikesToPlay0 btw)