Sorry, that wasn't clear to me at all. Lincoln aside, Indra may have accepted her and agreed to mentor her, but that relationship was never fleshed out in season 2. I don't think the two of them have even been in the same scene this season. So while that explanation sounds great, that wasn't how the show presented Octavia's journey to becoming a grounder. From what I remembered it was her love for Lincoln and at the time knowing he was not going to be accepted by the Ark group, she chose to go with him instead. None of the so called inner turmoil and her own ill treatment, which seems more like anecdotal evidence because that's not at all how her character and motivation was portrayed. Maybe I'm wrong but I don't recall an instance where she renounced her origin because of how she was treated.
To be honest, I didn't really have a problem with this until she shamed Lincoln, acting as if she's been a grounder all her life. If anyone would know what he is going through it should be her, yet somehow she felt it was her place to do that, which couldn't be further from the truth.