I never understood how Betty is ”like a child”

Betty’s therapist says that Betty’s emotions are like those of a child. People on this sub say it all the time.

I don’t get it. To me, she just seems like a normal adult acting like most normal adults would act in her situation (okay, maybe with the exception of how she handles Glenn, but…)

What am I missing? Maybe this is evidence that my emotions are like a child’s… 😬