It's also a problem with implementation - domains should be limited to the portfolios of the gods. You shouldn't be able to create a Selunite cleric with a trickery domain powers.
To make up for this I respec her to life cleric and make an offering at the statue of Selune asap because the Cleric of Selune with a trickery domain just bugs me . . .
It is not a problem of implementation. In fifth edition, the domain portfolios of gods are suggestions, not limitations. In fact a cleric is not even required to pick a deity at all. You may think of those rules what you will, but this is what the game is based on.
Personally, I also prefer it when a cleric's domain aligns with their god. Straying from that may make sense if it fits the RP you're going for though. A trickery cleric of Selűne is certainly strange. But I believe I can make a strong case for it using Shadowhearts story.
Having a life/knowledge domain forced upon her after act2 doesn't make sense from a rule perspective. So it just boils down to what the player feels is appropriate. In my opinion staying trickery is a better fit, but that's just me.
