Suggéré

Only really guesses

Looking for 1 word, preferably a verb (as bridging) that expresses the meaning of mother’s presence in the context, i.e, being confident and present when the first separation between child - mother happens.

le passage qui précède est plus éclairant :

"Three Ways to Cultivate Stronger Connections
While the circumstances behind the challenges in our relationship will be different for every parent and child, there are a few attachment strategies that can be useful in repairing what has been broken.
Consider a child’s receptivity to a relationship and bridge the distance – Before proceeding to cultivate a closer connection, it is important to consider how receptive a child is to having one with you. If the cold shoulder is a consistent response, then bridging the distance between you may be the most important thing to do. Bridging means sending a message to the child that you seek a connection with them but will not pressure them to be closer to you than they are comfortable with."

malheureusement je ne vois pas de mot unique en français mais celui-ci est utilisé dans le domaine de la psychologie parent-ado