Although the top of the enclosure is metal wire space far enough apart for a bug to get in, I think it's unlikely that she ate a lightening bug as I only had her one day before she started with these symptoms and my bedroom door had been closed that entire day. But thanks for the suggestion! I will look out for those bugs in the future!
To reverendsterlin: She was housed with another gecko and that one is still healthy and acting like normal. I inspected the enclosure and nothing appears to be out of the ordinary. I don't use any toxic cleaners on my enclosures but that is an interesting point and I will keep that in mind for the future.
Thanks for the support and suggestions everyone!