A bit trivia, you can get her (she is one of the four 5 star girls (rare) including the jiggle-jiggle grizzly, which only needs a small amount of item to get) by only putting each 30 points of the manpower, ammo, ration, and parts.

BUT, you also need to get blessed enough from RNG to get her. Unlike the yandere Negev who chose his commander alone.

And yes, getting Thompson by long spamming 30s is consider lucky.