Jean Grey's 80's Classic X-Men Phoenix backstories plus Generations Phoenix and X-Men/Teen Titans

In Classic X-Men #6, we see Jean preparing for a date with Cyclops.  She keeps a painting of the Phoenix and the Carpet over her bed.  It is foreshadowing of things to come and it may be where she derived the Phoenix effect imagery from (before it was retconned into others giving it that shape).

In Classic X-Men #8, it is revealed that Jean called out to the Phoenix Force for help on the shuttle.  It has been aware of her since her conception as it has known the universe.  The Force as it appears to Jean is shaped by Jean's consciousness. The force creates a new body and asks Jean to take its hand so the two may become one.  Once they merge, Jean says she didn't realize her original body would still exist.  She says it is her as much as she is herself in this new form.  A spark of her soul still resides in the original body so she places it in a cocoon just in case things go wrong and she needs it.   She rises from the bay as Phoenix.

In Classic X-Men #13, Jean and Misty Knight enjoy a campfire on the beach.  Later, they encounter a shark and are aided by some dolphins.  Jean uses her telepathy to allow Misty to see through the mind of a dolphin.

In Classic X-Men #17, Mesmero mind controls Jean.  Luckily, her Phoenix powers prevents him from assaulting her.

Classic X-Men #18 adds a page to Jean's fight with Magneto.  Then in the backstory, Wolverine, Banshee, and Nightcrawler tests Jean while they are camping in the woods.  Jean demonstrates her power by levitating all the water in a lake.

In Classic X-Men #24, Jean is being seduced by a man named Nikos who is really Mastermind in disguise, while she is on vacation in Europe.

Marvel Generations Phoenix and Jean Grey #1 takes place during the Classic #24 backstory.  The Vanishing Point sends Teen Jean back in time to interact with adult Jean while she was on the beach.  Adult Jean and Teen Jean go clubbing and then on an adventure in space where they fight Galactus.

In Classic X-Men #42, it is revealed that when Xavier worked with Jean when she was 11 years old, an aspect of her subconscious mind reached out as Phoenix and touched the mind of young Scott in the orphanage. 

In Classic X-Men #43, Jean meets Death in the afterlife after committing suicide on the moon.  She appears in the White Phoenix costume for the first time.  Death explains that Jean's soul is most closely carved from the Phoenix.  Most of Jean's life was pre-ordained so that she would become the Phoenix.  It is her unique gift to be the one to wield the Phoenix and that it belonged to her by right and would come in time to her children.  At the end, Jean is sent back to life, but there are more pieces of this life than she understands.  She is split among her clone Madelyne Pryor and her original body in the cocoon.  She must learn, the hard way.

In DC and Marvel Presents the Uncanny X-Men and Teen Titans, Jean's spirit shows up to warn the X-Men and her parents about Darkseid's plans to reconstitute a psychic construction of Dark Phoenix.

Jean's spirit may have appeared to Cyclops in Uncanny X-Men #144 and later to Wolverine when he had a near death experience in his solo series issues #32 and #33.  Although, Jean was not dead in 1990 when Wolverine #32 and #33, in later stories she says that when she dies and is reborn she leaves a part of herself at the door of the afterlife.