[Boogieman]

“The bacterium evolved.”

How do you figure? The bacterium found a host, and infected it, killing off those in the host population who could not tolerate the infection. How exactly does this change the bacteria into something fundamentally different?

[Rudder]

Moreover, the bacterium induces the insects to produce a larger number of daughters, advantageous for a bacterium that is passed to the next generation only by the females.

Actually, I'm not sure whether either evolved (as depicted in this scenario), but the bacterium has exploited or manipulated the birth ratios of the insect. Could be mutual adaptation.