How do you make a relationship better?

hmm I guess begin by asking her to step outside for a moment privately (so her sis wont be there during your phone call) and start by asking “hey, I noticed that whenever I try to talk to you about you talking to your sister whenever I call you get upset at me. Why does it upset you?” that way you get a feel for how much you can push. Then when she explains, tell her that you respect that (whatever weird reason it is) but when she does that, it makes you feel like she doesnt value your time talking to each other. Tell her that because you are so far away (slip in a couple “because I miss you so much” ‘s, cant hurt) you like to talk to her privately so that the two of you can have a more meaningful conversation. Hopefully that will clear up the phone issue. As for the arguing, if its more than just her being irritated about the talking to her sis thing, when you argue, just slow down and think before you speak, even if she doesnt. One of you has to keep a cool mind, girls tend to just get angry. Just slow down, and try to see things from both sides, even if she is in the wrong. And if she wont budge and you know that you are right AND its a fight you have to win (some arguements are not worth it and are best dropped) then tell her “well, ok, I see, but try looking at it from my perspective. “ then explain in detail how you feel about what ever is going on. Now I dont know her, but she MAY be getting irritated because she feels like she has to. Is her sis older? If her sister doesnt like you she might just be trying to keep on her sis’s good side by acting indifferent towards you. But again, I dont know her. Its just a stereotyped response to the situation. hopefully this helps