Renewed I-94 not returned

aig

Registered Users (C)
My mother visited US in 2002 October, while entering she got only 1 month I-94. then she got an extension for 6 months. While departing she did not return renewed I-94 from bottom part of approval notice. However she did return first I-94 which she got at time of entry.

She is planning to come again this month. Will this create any problem while entering US. Gurus please help
 
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