sorry to hear that
I do agree with you that your daughter should not be able to accept the compensation. she is a minor, and unable to contract. that matter can be taken up with BA here in Australia. however.. again, I am not sure of the compensation given that sector was one of many in a through ticket. at best you might be able to get the voucher converted to a
ex gratia cash payment here in aud.
I also agree some of the comments were a little off mark. there is, and never has been in this thread any question of a language issue. to introduce that did come across as condescending. we all know what the law is in the UK, but that doesn't stop us having the right to be frustrated with that law, or to comment that it is sometimes less than satisfactory in it's operation.