Now if you read the rest of the passage they talk about the balance of forces.Then Harry talks some BS about Mab attacking and suggesting that she isn't that crazy. Enter Maeve who suggests that Mab is that crazy. You know this isn't true, Harry on the other hand is clueless. It's part of Maeve's plan. The reality is that the imbalance is worse than anyone at that point in the book is aware of, because Mab is down 3 of her starting four. Then some random Denarian walks to her front door and huffs and puffs and blows in her effing door with Hellfire. Mab being made of sterner stuff than me doesn't wet her panties. She does wonder which, of the small number of people who could open a portal in that close, did so, with Summer in the running for Mab's a--hole of the week award.
Mab being down her top three agents is getting closer, but Mab didn't know she was down her top three agents at that point. Maeve's actions in PG revealed that; after Mab didn't act against the Reds. She was down Lea, but Slate was voluntarily down. At any point, Mab could have appointed a fill-in Winter Knight while she convinced Harry to be their replacement. That temp Winter Knight would have been Fix's match very quickly. Temp knight can be sacrificed on the Stone Table just as much as Slate when Harry is cornered to take the mantle.
In any respect, if Mab was worried about bluffing against weakness, playing everything like normal seems to be the way to preserve the balance instead of making Summer and everyone else extra curious about what was wrong with an erratic Mab.
Sure it does, those infected with Nemesis don't act irrational all of the time. If they did they'd be too easily spotted.. Take Justine, totally infected when she worked to get pregnant then black mail Thomas into an assassination plot, she almost had Harry completely fooled when he went to break the news to her, then he couldn't put his finger on it, something seemed a bit off, is all. However he didn't have time to figure it out. Lea was mostly rational, rational enough to realize what had happened to her and appealed to Mab for a cure, but not before she had spread it to Maeve. Mab wore the Knife also for a time, so it is completely logical that she also suffered a degree of infection or feared that she had to go in for prophylactic treatment.
No, if Mab was herself enough to order Molly brought in, she was herself enough to give the order to retaliate against the Reds. Mab wasn't worried about herself being Nemesis infected.