No one has a legal obligation to speak to the police.
That isn’t entirely true. In roughly half of the states, if an officer suspects you of a crime you are obligated to identify yourself and provide your name. Colorado is one such state.
This lady partially matched the description of a robbery suspect who had threatened someone with a knife. They tried to stop her before she entered her vehicle, but were not able to. They had every right to ask her name and what she was doing, to determine if she was the knife wielding robber they were looking for, and she was legally obligated to answer.
They should not have escalated by breaking the window. However, once she started driving the car dangerously, lethal force was justified. Whether lethal force was absolutely necessary would depend on specifics we don’t know from this article, but the legal bar had been met. The fault is with their escalation prior to the use of lethal force.