There is no such a requirement. With that said, oftentimes it is asked for by CBP in order to make sure you are planing on leaving on time.
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It is a very good idea, since you need to prove she has no intent to immigrate. If there is no date when she intends to depart, they may not admit her, since she is essentially moving to the U.S. Rather, have her come for a limited amount of time such as 2 - 3 months and then return. If she keeps to the terms of the visa, she has a good chance of getting another tourist visa next year.
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A return ticket is an indication that one will actually leave the US. The length of stay will be determined when she enters.
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You don't have to have a round trip ticket. But it surely helps to show that your mom will go back..
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