I’d say that she still isn’t convinced to fight for the Rebellion in the Hologram scene. She is actually more interested in finding and rescuing her father. It is only after his death (strangely, at the hands of the Rebellion) that she decides to get the plans. I don’t think she ever really aligns with the Rebellion, more accurate to say that they both have the same objective in the end.
pretty much this. she seemed very antagonistic towards the rebellion during her time in yavin. she was always a lone fighter - but in the scenes where she discovered the truth about her father, she stopped fighting for herself and started fighting for somethng bigger, even if still as a lone wolf. at no point during the film she’s a rebel (as in a member of the rebellion) imo.