Monster Mediums - Watercolor

This is Ghila.  In Hebrew Ghlia's name means joy. That couldn't be closer to the truth.  She loves to love. She loves her mom and dad, she loves going to school, she loves going to bed, she even loves eating her spinach.  Ghila is a swimmer. Ghila has won many awards for swimming competitively. She swims in competitions since she was in fourth grade. She is now in eighth-grade and you guessed it loves to swim.  You can't help but LOVE Ghila!

Can you guess what medium do Ghila is?