 No, someone brought Mom the necklace as a gift.
( No ( , ( someone ( ( ( brought Mom ) ( ( the necklace ) ( as ( a gift ) ) ) ) . ) ) ) )
(ROOT (S (INTJ (UH No)) (, ,) (NP (NN someone)) (VP (VBD brought) (NP (NN Mom)) (NP (NP (DT the) (NN necklace)) (PP (IN as) (NP (DT a) (NN gift))))) (. .)))
Mom didn't have a necklace and nobody got her one.
( Mom ( ( ( did n't ) ( have ( ( a ( ( necklace and ) nobody ) ) ( got ( her one ) ) ) ) ) . ) )
(ROOT (S (NP (NN Mom)) (VP (VBD did) (RB n't) (VP (VB have) (NP (NP (DT a) (NN necklace) (CC and) (NN nobody)) (SBAR (S (VP (VBD got) (NP (PRP$ her) (NN one)))))))) (. .)))