Black strings in baby's poop?

So I just change lo and saw like 4 thread like strings in her diaper. What Can It be? I'm worried and waiting for a call back from her ped.

00
    06/02/14
    I don't think its hair, it wasn't in her diaper when I put it on. I called my mom for advised and all she could say was maybe I'm giving her parasites because I'm breastfeeding and its not healthy for her. I couldn't be more pissed!
    0
      06/02/14
      Still waiting for a call back I still have the diaper. hopefully I can get an app for today or early tomorrow.
      1
        06/02/14
        4Katie
        Did she eat a banana recently? Bananas can cause you to have black strings in the poop.

        Digested blood will be black too but it is more like coffee grounds and not like strings.
        1
        06/02/14
        No banana
        0
          06/02/14
          they gave me an app for tomorrow at 7
          1