If you spent your entire life fighting to preserve a democratic republic only to discover your husband ushered in a violent dictatorship which oppress your future children indefinitely, losing the will to live is a natural response.
A natural response when you have two newborns? Padme was a bitch then with no care for the two helpless young children that would be left without a mother just because she cares more about someone she knew was a psycho all along. Nothing supernatural about it either, no matter what stupid theories fans like to come up with. Lucas himself said that she died of a broken heart and lost the will to live, so there’s the official explanation - Padme really was a selfish bitch.
When you have children of your own you realise just how much you will fight for them no matter what you have been through. There is no way you would leave them parentless.
MEDICAL DROID: Medically, she is completely healthy. For reasons we can’t explain, we’re losing her.
OBI-WAN: She’s dying?
MEDICAL DROID: We don’t know why. She has lost the will to live.Although the medical droid states Padmé lost the will to live, it never states that the loss of the will to live is the only cause of her death. On the contrary, it states that Padmé is dying “for reasons we can’t explain.” Losing the the will to live was not the primary cause of Padmé’s death; it was only the subsidiary cause. The primary cause was something inexplicable and supernatural. Presumably Palpatine withdrew the Living Force from Padmé to save Anakin’s life, which is why if you listen closely Padmé’s heart stops beating the moment Anakin’s heart starts beating again.
The droid says she is completely healthy and the only thing mentioned is her losing the will to live. Nowhere does it point to any supernatural cause, thats just fanwank. And were we watching the same film? Vader doesn’t die so his heart never stops beating so how could his heart start beating again?
So you would have preferred for Padmé to have survived and said, “I will take Leia and live with her on Alderaan. I don’t care about Luke though. He can go live with his aunt and uncle on Tatooine”?
Well, it does make a lot of sense to separate them. They’d both be very valuable to the Empire if they should ever learn their true identity, so having them both in the same place could be potentially disastrous. She wouldn’t have abandoned Luke, but rather left him in the care of a trusted friend for his own safety. This is still technically what happened in the current post-PT canon, Yoda and Obi-Wan decided to separate them for their own safety, with the intention of re-uniting them at some point when they were older.
It would make logical sense to separate them, but it would not make emotional sense for a new mother. If Padmé was still alive, she never would have agreed to that. It would have been out of character.