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When you say it went unanswered do you mean it just rang out or went to the mobile answer machine. I'm guessing here but if it went to the answer machine, even for a second that will count as a connected call and there will probably be a minimum one minute charge for each call.
I think it only records on your bill if it does actually connect, not just for trying, so it sounds like it has connected albeit only for a few seconds.
Yeh, one call, leave a message on answer machine or text or your daughters number will show up on her mothers phone as a missed call and when her mum is able could call back.
If a time is shown on your bill then it means the call was answered. It must have been going to the mobile voicemail. If a call is terminated before it is answered it will not show on your bill as there is no charge for it.