Either same red as her eyes or mauve (not dark, but it goes with her hair). I'll start with an outline, but I'm not drawing over others' pixels.

edit: I'm going with maroon, darker than the eyes.

How do you feel about changing the dark purple in the text at the bottom to purple so it's lighter and easier to see? I did a test on the top of the T, see how you like it vs the dark purple.