Help Dog wont move can't afford a vet

my 2yr old chiuhiua female her left hind leg is sticking straight out and is stiff her left front paw looks dead it's limp i cannot afford a vet yet she's one of my kids and i can't leave her like that she cannot walk nor stand up or she will fall can someone pls tell what they think it might be i know she did not get runned over she's an inside dog thank you

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