How old is she?
My DD1 was referred (by her school, with my permission) aged 6.
Diagnosed with ADHD and we agreed to try her on Ritalin.. she was a whirling dervish who couldn't sit down let alone concentrate although school felt she was very bright. she didn't eat, didn't sleep and while never agressive she could argue like a Jesuit!
I found her VERY hard work. I knew it was not my parenting, as she is one of four and the others were nothing like her. However the Ritalin was amazing..it enabled her to focus and settle, and we discovered she was indeed very bright.
She stayed on it til she was in her teens then decided to try without for a few years. She aced her gcses, and her A levels, but remained something of a trial at times to her teachers
her chemistry teacher shut her in the cupboard for 10 mins in 6th form just to have a break 
She became much easier to live with as she got older and her ADHD has actually enabled her to be a brilliant student.. a lightening fast mind, doesn;t need sleep, and learn things so quickly. She went back on Ritalin at 18, and is now in her 4th year studying medicine, where she is a top performing student. She will be doctor in just over a year's time.
When dd1 was an impossible small child she told the paed she was going to be a doctor when she grew up, and the Paed said that she should go for it, and that there are many brilliant minds around who have ADHD.. with the right support (and meds if necessary) it can be channelled.
DD1 was her worst aged 6-10 and gradually got easier and easier.. not a hideous teen at all, and now she is an amazing young woman; and she still has ADHD :)
I hope your daughter gets the support you both need.. it CAN be ok!