Citalopram

Hi, my daughter is 16 and after complication with fluoxetine has now been prescribed citalopram, which reading the instructions and looking online aren't recommended for use under 18. CAHMS attitude is take it and to be honest not interested in her concerns and the dr roughly the same. She has Aspergers which was eventually diagnosed last year and has high anxiety issues. Has anyone else under 18 been prescribed this medication and how have they got on with it as I'm at my wits end worrying about it?