The answer is conventional. Conventional level at this kind of level, conformity to social rules remains important to the individual. However, the emphasis shifts from self-interest to relationships with other people and social systems. The individual strives to support rules that are set forth by others such as parents, peers, and the government in order to win their approval or to maintain social order.
The correct answer to this open question is the following.
According to Kohlberg's stages of moral development, she is most likely in the Law-and-Order Orientation stage of moral development, in Level 2, Conventional.
This is Level 2, Convengtionlal, stage number 4 called Law-and-Order Orientation stage. The author says that during this stage of moral development, the individual does what it is supposed to be right. In this stage, rules have to be applied equally to everybody. This is the way for a society to work and correctly function. That is why Veronica -although she sympathized with her neighbor- filed a complaint against her because she wanted to follow the law and do what is right. The name of the sociologist who developed this theory was Lawrence Kohlberg.
