I think that is the yolk from her egg? I could be totally wrong, but that is what I thought.
I also think taking some of it was a good idea, because they are supposed to absorb it, so it seems like it would be exactly what she needed. Again, I don't actually know this.
Thank you for sharing this story! I'll keep that image in my mind of her taking her first meal!It is kind of scary how little she is and how much of her lump/yolk thing she was unable to absorb, but unless I remember the numbers wrong, I've seen stories of smaller hatchlings (twins) that did just fine. Please keep us updated!