Rewatch the episode of the hug:>Moon is pleased with New Monster Town and how well it works. Monsters are polite, hard-working and love Star.>The first thing Eclipsa brings up when meeting her is how bad she feels about what happened and tries to talk things out.>Moon simply changes the topic and pretends everyting's cool for the next hours.>Upon seeing Globgor she finaly pulls a knife towards Eclipsa's back: "I understand you desperately trying to bring him back, it's terrible not being able to see your loved ones" pum! Passive agressivity as its finest.>Nobody notices so the evening proceeds and Moon points out Meteora is exactly like Star as a baby (this is important because Meteora is the only one Moon planned to save during the first terrorist attack)>Moon refuses to live in the temple as Eclipsa proposes and when Star asks if it's because of Globgor she states the following:>"The Monster King is not a problem, Eclipsa is. I don't trust her"
Moon never intended to talk things out with Eclipsa, she just acted politely to check everything in New Monster Town and decided who deserved to be saved (all civilians included the monsters and Meteora). That's why the first plan only required the MHC and her keeping a low profile as an ex-queen not interested in politics.
The first plan failing because of democracy and Mina poisoning her mind in the back fed the flame to a whole new level, in which mewmans were the perfect tools for conquer.