Just to clarify, I'm not talking about trade offs because she should stay a token tragedy or because I'm giving Larian an easy way out/a compromise, I'm talking about it because mostly every other character has a trade off or a catch to their good ending, so if she's ever brought to their level (with additional content, quest, locations, a new end to work towards, etc) - that's very likely going to be the level.
Expecting them to do a complete u-turn from the token tragedy to one of the characters with the most perfect no-drawbacks ending ever might be, well, a stretch (not to mention the implications for the other characters then, people will be rightfully mad). Although, by all means, shooting for the stars is always good, I'm all for it.
By the way, who does get a no-catch happy ending, out of the main six? Shadowheart either loses her parents or is left with an incurable wound, Wyll loses his powers and stays a devil forever, Astarion can't walk in the sun. I suppose Origin Gale is a contender - normal Gale however still has his bomb to worry about if the crown is destroyed. Lae'zel, I guess, in the scenario where you save Orpheus, gets everything she ever wanted. Or if she stays with her friends. Altho the former is still remaining a follower/worshipper, and the latter is also wrestling with identity loss, I'd say. But still, she might be the luckiest of them all, potentially. Well, there are also Tav and good Durge, but they're a somewhat different story.