Marcela has a low activity level, is somewhat negative, and displays a low intensity of mood. she is considered a(n) child.

She is considered a slow-to-warm-up child

Slow-to-warm-up is a temperament attributes of children which is used to describe their general tendencies. Slow to-warm-up children are recognized by their mindful nature and wait and see behavior. They slowly adjust to changes, new situations or routines when they are given time to warm up. They also take their time and consider options when making decisions.

to stay where they were until m sent for