I too agree she likely crashed into the ocean and it’s one of my top theories as well. It’s the only explanation for why her plane’s wreckage hasn’t been uncovered yet. People have been looking out for her plane for nine decades, if she had managed to land somewhere I’m sure someone would’ve found her by now but I could always be wrong.
However, I still think it’s possible they made an emergency landing on a remote island somewhere along their flight path and lived as castaways until perishing. The fact that cosmetic products consistent with ones Earhart was known to use were found on Gardner Island has always stuck out to me
An aircraft - especially one like the Lockheed Electra 10 - would not suddenly crash and disintegrate if it ran out of fuel. The pilot would be able to control it into a water landing or ditching. If near an island or lagoon, a "crash landing" on land or a water ditching alongside the island might be attempted.
Pilots and navigators plan a flight carefully and fuel consumption is a major consideration in a flight plan. You always plan to arrive at a destination with a certain amount of reserve fuel on board in case you have to go to an alternate landing site.
In Amelia's case, we know that she was running short of fuel but don't know how much she had because she didn't say. She also did not say much in the way of her intentions. Those are two significant bits of information to include in any emergency message.
In her last transmission, she said she was running north and south on a line which could have been a sun line of position or some sort of radio direction finder vector. She could have seen another island while hoping to find Howland.
It is also possible that she decided to head back along her original course hoping to locate a landing/ditching place in the Gilberts. If she had drifted north, a heading to the west would take her, instead, over the Marshalls.
As with many possibilities and theories, the stories of possible radio messages sent by Amelia after her plane would no longer be airborne provide researchers with much to question, discuss, and consider.