Smith was identified by Holgerson and insisted that she is a friend who simply wanted to help her overcome her fears.

That raises an interesting defense.  There is no evidence of a malicious intent or desire to injure Smith.  However, that may not matter.

The crime is oddly defined in Washington state with specific reference to a drive by shooting charge:

RCW 9A.36.050 Reckless endangerment.

(1) A person is guilty of reckless endangerment when he or she recklessly engages in conduct not amounting to drive-by shooting but that creates a substantial risk of death or serious physical injury to another person.
(2) Reckless endangerment is a gross misdemeanor.
It certainly does seem to fit pushing someone off a bridge. However, Holgerson was preparing to do precisely that and Smith may not have believed that she would be physically hurt.  Nevertheless, she was harmed with five broken ribs and lung injury. Smith said that she has apologized repeatedly and tried to visit Holgerson but was turned away.