What should i do?

My friend & her guy have been talking for 1½ years. He came to visit in july for work, but after that the dynamic changed and he started acting more distant leaving her to react more insecure/clingy. They had alot of arguments but worked through most of them..they cant be together tho bc of cultural reasons but they both care about each other alot. Anyways in october they had an argument & he hasnt spoken to her since. She still misses him & worries about him so shes thinking to buy a plane ticket to his city ($500) from friday-sunday. To see him, talk it out, & if hes done at least thats closure, she can move on knowing hes okay...

I told her that might be selfish on her end bc he wont respond to her texts so that means he wants space...but shes saying maybe he deleted his social media or silenced his phone bc she asked his friends to nessage/call him to see if hes okay but he wont respond to then either, so thats why hes not seeing her messages maybe. I dont think she should do this, i think maybe she has good intentions but i just have a bad feeling overall. I want her to be happy, shes been the worst ive ever seen her, and i do hope seeing him in person will help them rekindle & fix things...but i just dont really think that will be the outcome. I get she wants to show him she cares & they can both stop hurting if they jus talk but I jus think doing this can also push him farther bc maybe hes already moved on and seeing her would ruin all his progress which could lead to resentment on his end & her getting more hurt. I dont know how to help her & im scared if it doesnt work out like she thinks it will, what she'll do (not like she'll intentionally do anything but jus what that pain will drive her to do). I love her sm & if she wants to show him she cares she should but idk why my gut is telling me this isnt a good idea...