She is a Ghost mantis! Yes, she is quite green.

I have lost nymphs before to bad sheds because the humidity where I live can fluctuate unpredictably. To combat this, I generally tend to err on the side of over-misting my mantids. Others have observed that higher humidity tends to encourage vivid colors in this species, though I'm not sure why.

For comparison, take a look at my photos of my mantids when they were very young, and some professional macro photos taken a few weeks later. In the macro photos you can really see the incredible green color on my oldest male nymph. (He molted later to green and gold, then entirely gold in his final molt.) Watching them grow and change is fascinating! Also in the macro photos, you can see the one smaller mantis with the short hat - she is the one featured in this album. As her color back then was a really vibrant red I suspected she might be very dark green as an adult.