First one makes some sense though I'd wonder how and why she was infected and not say Lara Raith or someone that could replace her
I mean there have been multiple Coup attempts in the White Court, Nemesis has attempt to replace Lara. As to why it hasn't infected Lara, I suspect you have to agree to me infected, at least in part, which I think is why Maeve and Lea had to agree to be purged of Nemesis.