You're here because our sire ordered you to be brought here."
You manage to hold back a comment about that much being obvious. She seems rather uncomfortable being in this position already, so maybe it would be best to just let her talk. She pulls a pad and pen from her front pocket and flips the pad open to the first page. "I wasn't given all the details, but she's accusing you of providing inside information to the Anarchs and conspiring against both her and the Camarilla."
That's true," Lucca says. "I find the notion distasteful, but even I have to admit that it's the only way forward in our world. But conspiracy being the norm wouldn't absolve you of the crime of working against a Seneschal with a terrorist element within her city."
"I didn't claim that it would," you say. "But I think it's important to note that every Kindred in this city has eyes on seizing power. The only difference is the scale of their ambition."
"You're not wrong," Lucca says. "But don't think I haven't noticed you never actually answered the question."
It looks like she's not going to be side-tracked. Hopefully she at least takes your point into account.