Dr. Jane Foster was an ambitious woman, you can't be a doctor or a phd holder if you are not ambitious. All her life Jane had wanted to prove herself to her father. She wanted to be more than just a normal human girl. She dreamed of being married to a prince and becoming a princess. Better yet, Jane Foster dreamed of becoming a goddess. And then her dream seemed to come true with the appearance of Thor, the god of thunder and the prince of Asgard. All of Jane Foster's childhood dreams seem to come true. It was then with the appearance of Butch that Jane thought Thor was gay. However later with the appearance of lady Sif, it appeared that Thor was bisexual. It did not matter to Jane Foster if her prince and god liked men as well as women. Jane Foster through her ambitious heart would pursue this bisexual prince and god. And nothing was going to stop her. At least that's what she thought. Until the appearance of Clara or better known as creepy Clara.
Clara had always been a wee bit unstable especially when it comes to the love of her life Ray. When Ray chased Jane Foster through another dimension, Clara's jealously was already flaring up. And when Clara found Ray unconscious next to Jane Foster, her jealous personality had blown up. Clara wanted Jane Foster dead, dead as a door knob. It was at that moment, Thor appeared before them and cradled Jane Foster. This led to Clara's jealously to reduce a bit, but she still wanted Jane Foster dead, crippled or put away. From Clara's insight, he could see Thor loves Jane Foster a lot, after all it was the first female human Thor met. Although Jane Foster was not particularly tall or attractive, she had somehow captured Thor's heart. Clara had to nip this in the bud, she couldn't have a god protecting Jane Foster. That's why she did that.
"Oh hello Thor ! Good to see you again. Do you remember me, it's Clara, one of Ray's bodyguards.", Clara said with a fake smile.
"Oh ! I remember you friend Clara. You are together with Butch.", Thor said happily.
"Ah ! You do remember, can you help my friend Jane Foster ?", Clara asked with a fake smile.
"You are friends with Jane Foster ?", Thor asked in a surprised tone.
"Yes, we are good friends, ever since that incident that you came down in New Mexico. Jane and I have kept in contact. She told me that she is in love with lady Sif and could not forget about her. She said she would do anything to take away lady Sif from you, Thor.", Clara said with another fake smile.
"Is this true ?", Thor said with a pale face.
"Yes. Jane Foster is a lesbian. She loves only female. She made me promise not to tell anyone even you. But since we are friends, I felt it was better if I warn you first before Jane could steal lady Sif away from you.", Clara said with a smirk.
"Oh....", Thor said as he had a look of understanding that suddenly appeared on his face. Thor now felt anger, all he wanted to do was smash this female human to pieces. But he was a god and had to appear benevolent.
"I know what to do.", Thor said with a really fake smile.
Thor proceeded to take both Ray, Jane Foster and Ray's three bodyguards back to Asgard. Thor left Jane Foster to some really nasty Asgardians in the Royal Palace of Asgard. These Asgardians were suppose to extract the aether or the reality Stone out of Jane Foster as soon as possible even if it kills her. Ray was taken to Freya for her to heal him. While Ray's three bodyguards were guests of Asgard.
Unknown to Jane Foster, when she woke up, she was in the middle of an extremely painful extraction process. The aether or the reality Stone was painfully extracted from her body and sent to the Collector in Knowhere. When the extraction process was completed, Jane Foster had died without knowing who had caused her death. Clara upon hearing of Jane Foster's death from Thor had been on cloud nine. Thor on the other hand pretended to be sad that Jane Foster had died, but inwardly he was smiling.
As for the aether or the reality Stone, it was kept by one of the elders of the universe, the Collector. And when Malekith and the Dark Elves came to get the aether or the reality Stone from the Collector, they were killed and eliminated by the Collector. The Collector was not a simple individual or a weak individual. You do not have the universe's largest collection without having some power to defend it. Hence we now have people in Asgard asking what happened to Jane Foster ?