Vomiting..?

Lola did something very strange today, she "threw up" a piece of nut that she had eaten earlier, while we were playing. She was not upset, didn't fling it around, or show any sign of distress. She simply started to pump her head up and down, and out came a piece of nut. Her behavior has been normal, lots of talking, playing, and exploring her newly re-decorated cage.

I am worried that she may not being feeling well, or that she got too many nuts. Or perhaps she is fine, and just loves me so much she wants to vomit on me. Either way, we are laying off of the peanuts for a couple of days and seeing if that may be the cause.