"Scolded" is fine -- it is not particularly formal.
Almost all of the suggested words are synonyms for "criticized," and many of these synonyms also carry with them an impression of the style (tone of voice, body language) in which the criticism is delivered.
- If the criticism is intense, she "berated."
- If the criticism is moderate, she "scolded."
- If the criticism is mild, she "chided" or "reproached."
A truly formal ways of expressing criticism is "reprimanded," but this implies that the speaker is speaking in a distant or formal way, like a judge or employer. A common institutional phrase is "a formal reprimand."
Another set of more formal words are "admonish" or "rebuke." These may be forcefully stated but convey a sense of the speaker's moral authority, like a preacher or prophet, and are often associated with religious writing, in which a holy figure admonishes or rebukes sinners (or devils).