I suspect Fidelacchius will be instrumental to remove Nemesis, at least from the baby.
The problem I see is: Is the baby useful for Nemesis now? Perhaps as a host, and protection to herself while she is carrying. So perhaps (hopefully) they are safe now. But what after the baby is born? Will he or she be useful for Nemesis or will it try to kill him/her? Because that will happen before the year until the wedding and all that.
Also, having Nemesis perhaps compete with the Hunger parasite? Thus helping Justine to conceive?
Lastly, we have seen in a short story that a Lamia is susceptible to Thomas power while inhabiting a human body, so...will Justine/Nemesis being susceptible to a full attack by Lara?
Agree about the corner hounds.