First of all, welcome to the forum
You really need to find a vet that will see her now. That is too far away. Explain that this small dog could have possibly been bred with a larger dog (if you don't know, anything is possible). This can endanger her life. Make it clear that this is the case and 2 1/2 weeks will not do. If your vet will not accomadate you, find another vet.
Others will be along to give better tips and advice. But first and above all...get her to a vet asap. Call and explain until you find a vet that will take her/see her. Good luck and keep us posted please!