I wanna your attention......
Having had Abys for years now, most of them are very vocal and get more and more vocal as they age. The whine. Graemer does it when he wants to play with his favorite toy...and they both do it when I am outside and they are inside. It is pitiful sounding. My neighbors tell me that they do it whenever anyone walks by. I'm surprised animal welfare hasn't called to check up on me.
My guess is that Fawn is bored and wants your attention. Or, is hungry or both or neither.....and just communicating with you.
:D