What can i do? i think my 14 year old has an eating disorder?

i have 3 kids. 19 year old son and twins who are 14 a girl (taylor) and a boy (tyler). four years ago i split up with their mother and i got custody of my oldest son but the judge ordered the twins were to be seperated so taylor had to stay with her mother. but 8 weeks ago i got a phone call of a doctor telling me to get a flight ASAP because taylor was in a critical condition after a serious head injury. they didn't expect her to live the night. it turns out her step-father and mother had been beating her and taylors step-father had smashed her head against a stone fireplace and fractored her skull. but despite the odds taylor pulled through and there has been no lasting physical damage and she is now living with me. she was in hospital 3 weeks and flew home with me 2 weeks ago when she was fit enough but im worried as she is not eating much she skips breakfast and lunch and at dinner time she doesn't eat harldy anything. what can i do? apart from that she has settled well