Thanks for that info. MS-13 is known to be in the following states Pennsylvania, New York, New Jersey, Miami, Southern California, Washington, D.C., Northern Virginia, Maryland, the Hampton Roads area of Virginia, Richmond, and Delaware. In Allentown, Harrisburg, Philadelphia, and other areas of Pennsylvania. This gang is comprised of Hispanic members, and they are very into tattoos and body modification. They tend to gravitate towards younger age teenagers as well as elementary school children. She may have made friends with someone or know someone who may be trying to enlist her, but not telling her much about the gang at all, in fact they may be treating it like a game, just to get her interested.
I'm not saying this is the case, but as you know, as parents we need to look at every aspect of a situation, and keep our minds open to any possibility until we find an answer. I wouldn't automatically accuse her of anything, just pay closer attention to what she's doing. You can click here to see more info on MS 13, some of the links have pictures. You can look through her notebooks and doodling to see if this number 13 is showing up.
Let me know if I can be of further assistance, or if you want to talk more