The campaign I'm in has hit a bit of a problem with conflict between characters. There is no issue between players at all, nor does it look like it will get that bad, but it is still an issue that would be nice to know how to best approach. I'd like advice for what can be done to get characters working together better, even if such ideas require the GM to set up events to help it work out.
The main problem is conflict between my character (The main healer of the party, using the vitalist psionic class from Dreamscarred press, which is relevant due to the unusual mechanics it uses for healing. Especially the unwilling participant feat for it) and the party ranger. It may be a bit my fault, as my character forced the ranger into being part of a telepathic collective so as I could cast healing and buffing effects on her, which I admit may of been a mistake and waiting till she needed the healing/buffs so as a chance to have it be a willing thing would of been much better.
The event that really started things getting really bad from my perspective was when the ranger stabbed a beggar in front of most of the party. The beggar did call out for the city guard in response, making the ranger flee, though a certain lawful party member asked me to stop the ranger. I did the only thing I could with my abilities, draining 18 hp and causing 3 damage bleed, which is rather significant at level 6. The ranger managed to tend to bleeding and still escape, but blamed my character for doing such a large amount of harm. This is also the event that when the player explained the why, the GM decided made her of evil alignment, due to backstory the GM hadn't read till then that would of made her evil to begin with.
Since then it's been a bit of a stretch for the ranger to even be working with us at all, feeling very forced. The ranger has made it clear she never wants to be part of the collective, meaning no healing, no buffs, no telepathic communication. Past clearly selfish actions of not sharing anything she finds while searching places (She tries to be sneaky about hiding what she finds, but is rather bad at that) but expecting a full share of anything anyone else finds, has resulted in the party not being willing to let her carry any healing wands or potions she did not pay for herself.
Last session things got worse, her going as far as spending the first round of combat picking up loot and trying to hide that she had found anything, while the rest of us almost died. She was spotted doing so by only one party member who just happened to be our smarter evil character (Which the rest of us think in character is lawful good for various silly reasons), whom after the fight suggested the ranger should get no future shares of any loot due to that action and not revealing what she had taken no matter how much we tried to make her. It was very hard to argue against that suggestion and the ranger had nothing to say in her own defence.
Any suggestions of how to solve this without forcing a change of characters? How can we best rebuild party trust?