Panda-chan, I'm borrowing your hypothetical situations.

Let's say Person A had friends who were very nice to her, did all sorts of things with her, etc. Could become best friends.
Then Person B and Person C decide to no longer be friends because of a fight.
Person A has to decide between them.

What should she have done?

In the end, she chose to not pick one friend over the other, and try to repair their friendship. The thing is, Persons B and C for some reason decided to no longer be A's friend. And took all of her friends with them.

Leaving her alone.

When she decided to try and make new friends, real ones (for maybe the last ones were not real), she made a couple of other really good ones. Who did everything with her too.

And then, she suddenly realized that those friends are actually a bit spoiled and bratty, and they left her too.

Leaving her alone again.

I kinda know what this feels like and am trying to show her that there are real good friends. Except, she's sorta worried that any new friends will leave her, and therefore has a harder time making real, long friends. She's fine with making a five-minute, let's-do-this-together friend. But other than that, she's sorta scared about making new friends. And she hides this by being a little brash and tactless.

Which scares people off. 

...Any suggestions?