Wait a minute
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That’s a magazine for an M&P 15-22, in .22LR instead of the standard 5.56mm NATO:
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Here’s a windowed 5.56 magazine for comparison:
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For the uninitiated, 22LR is essentially a training and small game round, like squirrel small. A standard AR-15 is typically in 5.56mm NATO, a military round specifically designed to be lethal to humans within combat ranges:
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Long story short, the strong independent black woman armed resistance leader is carrying the type of gun you’d literally let your kid shoot for his first time.
It’s not useless, but in this context it may as well be a prop. The only question is did someone give that to her not trusting her with the real deal, or did she pick it herself because it’s cheaper and not as scary.