What type of clause is shown in parentheses ( when the road got too muddy for the stroller ) she carried the baby?

The clause in parentheses, "when the road got too muddy for the stroller," is a subordinate (or dependent) clause. It cannot stand alone as a complete sentence and provides additional information about the timing of the main clause, "she carried the baby." Specifically, it functions as an adverbial clause, indicating the condition under which the action in the main clause took place.