Hello,
If the teeth start emerging"outwards" at the age of 20 -21 which is ironically also the age of wisdom teeth to erupt.They, however, do not have this tremendous effect on teeth to push them outward. You should take your daughter to an orthodontist for the right treatment plan.
Invisalign treatment works well with some cases but can be made sure only after preliminary results are supportive
She needs to get a cephalogram and an OPG to plan treatment.Also visiting a dentist will be a much better option as they can check the patient in person and see the findings which are not visible on photos.