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HI. Welcome. My name is***** I'm sorry to hear about this situation with Nyla. Is this swelling painful? Is she still eating and drinking?
Ok. I'm going to say that this "lump" shouldn't be due to the amoxicillin. This lump in a young dog like her has me suspicious for an inflamed lymph node, cellulitis, or an abscess at that location. With her not wanting to eat, that is most likely due to the pain and inflammation at that region. My best recommendation is a recheck with your vet so they can palpate the mass and to most likely aspirate it to determine the underlying cause. Once that is determined, she may need a course of a stronger antibiotic than the amoxicillin.