As someone who also lived abroad I can relate to the family wanting her to move back, I had similar. Imo sticking it out will hopefully allow her to grow, adapt and get stronger. Moving home, for me anyway was a mistake.
I am actually trying to get my missus on board to move to Poland with me and our son.
Do your best to support her and encourage staying where she is.
Obviously my opinion is very loosely applied to her situation with me not knowing all the details but moving home to the security of family is the easy way out of what could turn out to be a worthy battle if she stays