This definately wasn't your fault. The player requested a Time-out, she didn't say "her shoe needs to be tied." Anyways, that should have been brought to your attention before the ball became live.
The only sticking point might have been (luckily it wasn't) the phrasing as a question. Some coaches might try to argue - she was just checking if we could, she didn't want one.
(1) [immediately after a field goal] CAN we take a time-out?
(2) [3 seconds left, and coach is screaming] Can we have a -%^&#^%$$ing time-out?!!_!!?#!??!?!!
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