Yes, tell them that she's way too tiny for her breed, and you have a case of failure to thrive. They should send a replacement. Metzer is quite good with this. And you're within the time limit.
Keep giving her the nutri-drench in her water dish. As Miss Lydia said, a separate brooder would...
Have you contacted Metzer? She does look way too tiny...
Be careful with the syringe feeding so she doesn't aspirate Keeping my fingers crossed that she makes it.