if thats the only difference in her,that is not a disorder,no one shoud ever be labelled with a disorder just for avoiding eye contact.many people do not like doing it,the main reason that people on the spectrum do not like eye contact is because it triggers a accute fight or flight reaction [overeactive stress chemicals],it differs in people with developed conditions like social anxiety disorder,with SAD their eye contact problem is based on the anxiety.have read of many people,including those on the spectrum and non autistic,say the reason they dont like eye contact is because it distracts them from what they are trying to say and think,and others [mostly on the spectrum or with other sensory disorders] say they are unable to think at all and lose all their other senses when having to do eye contact [sensory jumbling].remember though,she is a friend-just support her where she needs it,but she doesnt need her eye contact medicalising,people are only diagnosed with disorders when it 'significantly impairs' some/all part of their life.
