Wind9 is a special offer of Wind on sale in this period. You pay 9 cent/min (rounded by the minute) plus 16 cent of setup fee (so first minute 25ct, then 9ct/min). But that applies
only for calls to Italian numbers.
Calling the US costs
50ct/min plus 15 ct of set-up fee. But maybe the dealer activated her the "Call your country" option (free for a new card) with which she spends 35 ct/min plus the usual set-up fee.
Anyway after each call she receives a flash-sms with the cost of the call and since all billing with that tariff is on per minute base it's really easy to understand how much is she paying.
Sending SMS is really straightforward: just write it and send it
She just have to remember to write your number in the international way, so whith the +, like explained above.