Hi , I'm James DVM MRCVS and would like to help you with your question
How is she in herself ?
What needs to be done is the following
1. The vet need to examine her to determine if this is indeed a phantom pregnancy. There could be other conditions which would look as if she is having a phantom pregnancy and they need to be ruled out .
once it is diagnosed , then you can go ahead with injections in order to resolve it or even an oral solution called Galastop .
There is always a risk of not feeling well , that comes with use of every drug but it is not for sure that Teal will indeed suffer any side effects . I found most of the dogs which had these hormone based drugs to have no reaction and the end result is a good one in stopping their symptoms and getting back to normal cycle rhythm.
I hope this helps , If you wish to discuss the matter more I will be more then happy to help.