Mo's reason why she thinks the Massacre is unlikely.
The reason the massacre had been possible in the first place was because the Uchiha were going to strike first with the coup, lending Danzo and the elders the excuse they needed to exterminate the clan.
Miko had eavesdropped on every meeting she could, even sneaking into the Naka shrine a couple times and didn't hear a shred of the word coup. If the massacre was to happen, it would be completely unjustifiable. Even more so then canon. While discrimination was still simmering in the crevices, it wasn't as nearly as bad as it could have been, calming the elders. Their recent influence also satisfied the more power hungry Uchiha. So even though she didn't hear all the meetings, she could be relatively assured they still weren't talking about it.
And there was the fact the Uchiha didn't pose a threat to the village this time. The bare bones of it was Danzo had Konoha's best interests in mind, and while he was unsteady due to the Uchiha's undisputed power, they helped the village. Economically, socially, etc. They sold many services and provided items that were extremely popular. Getting rid of the Uchiha especially when then helped so much with Konoha's unhealthy economy would be just plain stupid.
Not to mention the Police Force. While Konoha didn't have as much crime problems as Kiri, They still had them, especially in a post-war climate. The Hokage relied on the Force to keep everything from going to hell in a hand-basket inside. They were vital to village security and stability. Some of the most dangerous criminals were locked under the HQ.
For those reasons alone it would be near impossible to get rid of them.
But then Miko came along.
She forged connections and built bridges. She endeared them (directly or indirectly) to the public. She literally tied members of the clan to civilians through Naruto's pranks and the weddings, spacing Uchiha all across the village-making it impossible to put them all in one spot. So say, if they tried to execute the Uchiha all in one night without alerting anyone, they would have to gallivant all around the village.
She smashed stereotypes, and turned the Uchiha into humans.
By going on 'play-dates' she showed the public through the clan heirs that they were connected. It was a symbolic gesture.
All this joint stuff, like the gardens with the Yamanaka and the 'restaurants' with the Akimichi, the Cat-Dog festival+clinics with the Inuzuka, working at the Force with the Nara had the effect of binding their clan to others and sharing power-while still retaining it. Heck, the Uchiha had even contacted the Aburame to help with insects in their garden, giving them a foothold too.
(This put some people at ease and put a check on the Uchiha. This was a delicate balance that Miko needed to watch closely because lose too much power and Danzo would exterminate them. Too much and people would get uneasy and point fingers.)
There was also they fact she had calmed rumors about who was behind the Nine-tails attack with the donations and charities to the orphanages, plus the clean up.
It was next to impossible to massacre the clan.
But, still entirely possible to try.