Thank you for sharing your concerns here.
I am hearing that this is indeed a hard time for you, as you are trying to work out your relationship with your partner and are worried about how things are at her home.
There seems to be much tension at her home and you find yourself not being able to control much of it, yea? You are also seeing that she is getting really affected by it; she seems to have expressed some suicidal thoughts and I understand you are very concerned if she might do something drastic if she feels very helpless.
Your concern is understandable.... I invite you to think, with a calm mind, when you can...... what options you see before you right now?
For one, it is good to know that the both of you are making attempts to work things out with your families. And that your family is okay with it as you have shared (Maybe you could share some of your feelings with your own family about how you feel about going abroad and seek their support, at least as a listening ear?). You mentioned that she has shared with her family (except her mother) about your relationship, and that she is facing a pressure from their side to sacrifice the relationship? The distress that you both are going through because of all this is probably a sign of how much the relationship means to both of you and how much you are enduring (tolerating) to make it happen.
Yes, it can be very hurtful and disappointing to not receive support from family when you choose someone as a partner and want to take it forward.
I would encourage you to hold on and work with it. It might take a while and some effort, for them to be able to see your side and maybe extend support. There are some things you can control about how things work with your families, and some things you cannot. Keeping this in mind could help you be more realistic with your expectations. Also, you might want to consider that they probably do not know what all you both share with each other, and the various reasons for which you believe in this relationship. You and your partner could also maybe hear what all their (families') objections are, convey your understanding to them, and maybe persuade them accordingly? It might take some time, patience and well directed effort from both of you to maybe put this across to them, if you value their support and need that to take the relationship forward.
And this process might be challenging, and it becomes necessary that you both stay strong for yourselves (individually), and for one another. Maybe you could communicate to her that you are there for her, that you care for her and will support her, at the same time, you both are in this together, and that you also feel troubled at times and require her strength and support. If she is able to see that her strength is something that you need as well,she might try and work on finding her strength from within to stay with this and work together with you. Yea?
Further, it could help if both of you are also focusing on other aspects of your life - your careers, interests, hobbies, and so on, so that this issue right now, does not feel like it's taking over your life or is overwhelming you.
Hoping this could give you some direction.