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Loyal and steadfast. Her true-blue fans have continued to support her, even during this scandal.
Loyal, faithful, as in You can count on her support; she's true blue. This expression alludes to the idea of blue being the color of constancy, but the exact allusion is disputed. One theory holds it alludes to the unchanging blue sky, another to the fastness of a blue dye that will not run. Blue has been the identifying color of various factions in history. In the mid-1600s the Scottish Covenanters, who pledged to uphold Presbyterianism, were called true blue (as opposed to red, the color of the royalists). In the 1800s the same term came to mean "staunchly Tory," and in America, "politically sound."
The sense of someone being true blue may derive from the idea of someone being genuinely aristocratic, or having ‘blue blood’. In recent times, the term true blue has become particularly associated with loyal supporters of the British Conservative party.