Actually, when she heard Musanea, Artie already had a feeling that something big was going to happen. However, this matter between Latodine and Musanea was a political stand-off that a measly archduchess shouldn't be involved in unless the invading side was planning to kill civilians and pillage duchies and territories. She knew that Selvig would seek her help in things like those.
Neither would Larkin hate it if she found herself in the middle of those as protecting the powerless had always been important. This place might not be Ellis Plain, but what if Ellis Plains came next? If the nobles wanted to stop her, then she would just use her relationship with the future royal couple.
However, she didn't think her bad thoughts were nothing to the words of the system.
[Warning! Salvation anomaly! The life of a crown bearer (Selvig Haussia, King of Latodine) is in danger. His death will result in failure of future quests, and earlier rewards will be forfeited.]