All of our rifles, personal or issued, have to go through an armorer's inspection. They've caught some issues with M&P Sports out of the box and they were usually simple issues to resolve. Afterward they've been just fine for our uses.
I've got a M&P (non-sport) and it shoots as well as my Colt in my hands.
So, to add to this:
1) Offering unsolicited advise, absent an immediate safety issue, is not something I'd recommend. Particularly in this context.
2) Patrol rifles honestly don't have that hard of a life, round-count wise. If it'll survive in the temperature swings and bouncing around in a trunk or rack, it'll probably do just fine. Given the distances domestic LE can realistically identify a threat and engage with non-magnified optics, the difference between a 1 MOA and 3 MOA rifle is negligible.
3) If she gets in to it, she's at least got a training rifle to beat on once she gets a "nice" one.