I need advice on how to format internal conversation in a novel.?

I'm writing a novel where two of the main characters can speak to one another in their minds. One of the characters is also the narrator. Normally, when I have her think something, I italicize it, but no quotes. When she is in conversation with another person with her ability, should I put her words in quotations or leave them off? In many respects, anything she thinks can be heard by the other telepathic character, but sometimes these thoughts are not directed to him, as in a conversation. So confusing!I need advice on how to format internal conversation in a novel.?
If one of the characters is the narrator, how about having her thoughts be in pain text? Just separated by punctuation from the narration. You might have seen this format before in novels.





Then for the mental dialogue, you can switch to italicization. However this would indicate that when she's thinking to herself, she's safely walled off from eavesdropping by the other character.





If they have no barriers from each other, you can let every thought be italicised. Line breaks can occur at the end of every person's line in dialogues, just like you see in conversation in most books.





Perhaps the mental dialogue is always separated by line breaks from the normal narrative, while the self-directed thoughts are never (usually) separated from the narrative in this way. (Edit: This is what I recommend.)





If you feel that in the context of some bit of self-thought the reader might mistakenly assume she is talking to the other character, or vice versa, and this is problematic enough to necessitate adding some words, maybe you can use ';I thought to myself';, ';I said to myself'; or even just have her say something along the lines of ';I broke off contact';, ';Alone in my skull once more';, ';He never knew'; near the thought: basically anything that might indicate she's thinking to herself.