Valid I-94 past Visa expiration date

spiderman03

Registered Users (C)
Hi,
My mother came to USA again recently using her 10 yr. visitor's visa. Though her visa stamp on the passport was expiring on Apr 20th 2011, the POE officer stamped her I-94 valid until May 26th 2011. So, which one takes precendence when considering the safe date for leaving USA without inviting any problems in future? Please advice. Thanks.
 
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