As much as I am in support of more well written characters who are female in the Star Wars films I have to say Padme isn't the way to go. At all. I'm fine if she's in the next films a little bit, like a pic on the wall or Luke or Leia going through old archive footage for a bit. Basing an entire trilogy on her though? No. It'll just contrive things into convolution. Wasting chunks of time to explain the hows and whys she either becomes a force ghost or came back from the dead. Her story is a dead end, literally, she's dead get over it.

Though I appreciate the hilarity of the potential irony that she could become a character able to get slashed up by a building sized creature on her back, survive a fall from a high flying vehicle afterwards, and become a force ghost while other lifelong force users were unable to. Yet the thing that killed her was that she just didn't give a fuck anymore and wanted to die.

"She's lost the will to live"
Padme - "Damn straight, I just don't give a fuck anymore. See you later as a blue transparent ghost thingy! Bye!"
Obi-wan - "Wait! What blue ghost thingy?????"
Yoda - "I'll tell you after she gives birth. Oh wait forgot I did that you me telling about things has to be messed up. *clears throat* Ahem, she will give birth afterwards I'll tell you."

Anyways yeah just create some new female characters without all the baggage of trying to contrive ways that she just happens to be showing up now of all times.