[quote=@Hebigami Shiho]
But isn't like afternoon? And doesn't everything reflect light in one way or the other? .-. Science is where all this shit enters up. As long as she can see it, I'm pretty sure she can eat it. D:
[/quote]

There's a difference between eating reflected light and eating Lacrima of two different elements that just happens to reflect light. If things get tight, I'll have Lucy jump in Deus Ex style, but for now my excuse is that if she absorbs any more demon particles, they'll overwhelm her magical healing.