Missing teen: gray hoodie, purple backpack

I lost my sister Maya Patel yesterday around 3pm in Southern Maryland. She's 16, about 5'4", with long curly black hair and a crescent moon tattoo on her left wrist. She was wearing a gray hoodie, blue jeans, and a purple backpack with a small star patch. We were near the CVS on Main Street in Prince Frederick and she walked toward the Calvert County Courthouse area by Main Street and then disappeared. This is really hard—she has a medical condition and I'm worried sick. If you see her, please contact me right away; we can meet at the Walmart in Waldorf or another safe place nearby to reunite.