Hey all, I could use some advice here.

I've been a forever DM for a long time, but recently joined a campaign as a player, which has been great, as I needed a break. However, I've come upon a situation in our campaign and I'm unsure of what to do.

I'm going to try to make this as short as possible. Basically there is some in-character conflict in the party, where one player wants my character to do something (and is using poor methods to try and convince her) and my character is struggling with that, in part due to her own past and also due to the way in the which the other player is going about it.

As a player, I am torn between what's true to the character and what's best for the campaign. My character at this point is somewhat integral to the story, so her just walking away throws a lot of wrenches into the story. At the same time, everything that is happening flies in the face of her backstory and character as a whole.

Any ideas? Thoughts? I tried to make this as simple as possible, but if more detail is needed I can add it.

Edit: here's the situation best I can write it out without being long winded

My character was born and raised as a "chosen one to a prophecy" to a temple. When she came of age the temple found out they had the wrong person, and threw her out with nothing but the clothes on her back. This was maybe six months prior to the start of the campaign.

Fast forward to now, through the events of the campaign, she has learned she is a "chosen one", though of a very different kind, and has the power to save the BBEG instead of trying to kill him. Since she learned of this revelation, I've been trying to play her as trying to process this along with her past traumas, since they're obviously related.

The methods the other player has been adopting has been to basically call her a child, tell her that this is what she needs to do, and that 'this is the job'. I've interpreted this as very similar to what she experienced growing up, and so all of these conversations are just pressing every "Past trauma" button my character has.