Hello Friend.
I think it depends on what/who caused the “break” in the friendship.
I have a good friend from years ago who cut me off, even sent my letters back with nasty writing written all over the outside of the envelope, etc., when I urged her NOT to divorce her husband, because God hates divorce and her family is worth anything to get it back together, even if it means forgiving hubby for things, and making attempts to reconcile. She couldn’t think of such, and hates me for suggesting it. I have written some post-cards to her, telling her I love her, forgive her, and if she’ll forgive me for anything I’ve said to offend her, and she has not budged. This was 3 or 4 years ago now.
If you do what YOU can, the rest is up to her. Just pray for them.
But if this is new, by all means make every attempt, after you have done that, let it go, and rely on God to change hearts.