Do you need to drink protein shakes? (to diet)

My mom is trying to lose weight and she has been working out and eating less but she also has gotten all these protein shakes to drink. Don't you onlyto drink protein shakes to try to gain weight (muscle)? And if you don't work out enough doesn't it just turn to fat and become counter productive if you are trying to lose weight. She isn't drinking them as a meal substitute but a supplement.
Yes, to gain muscle
No, they are useless
No, they make you fat
Yes, If you drink them instead of eating
No they are unhealthy/ other (please specify)
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Do you need to drink protein shakes? (to diet)
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