Hi! I'm Scott, and I hope I can provide some useful perspective on this issue.
Be aware that I am licensed in California ONLY, and in any case, lawyers here cannot provide specific legal advice to specfici legal problems, rather only address legal principals generally.
Sorry, I've just been answering you question as there there was a danger of this person abducting your child.
On seeing the doc you sent: The short answer is, you proabably should consult a lawyer qualified in you current state. Or consult a lawyering in Colorado about stepping in on your behalf there, since you are out of state.
I don't know how far away you moved, but presumable it's a hardship to travel back to the court there, so you can ask for a change of venue.
In any case DO NOT LET THE DUE DATE FOR FILING A RESPONSE PASS!!
File the response!
If you're out of state you still have 20 days or so to respond, but don't miss the deadline.
Sorry, but that's the best I can do without crossing the ethical line of offering legal advice: file a response before deadlin, and consult a lawyer.
If you need financial help, local legal aid should be able to provide some resources.