I can't conceive of Marvel ending her arc here. She is a very popular character, and I have to say, having a villain "redeem" themself by committing suicide (particularly when it wasn't "necessary" plot-wise to do so) is both problematic and a rather distasteful, abrupt, lackluster end to a longstanding character's arc. (Let's not forget that this is at least the second time Marvel has gone this route, with the previous example being Ikaris.) She'll definitely be back, and they left it intentionally ambiguous by not showing a body, effectively letting the protagonists win without officially killing off the villain. As established, she's a hard character to kill, and it's pretty unlikely that several tons of rubble would end her. I want them to put in the effort to give a satisfying conclusion, one that allows the audience to decide to forgive her and let her be redeemed, or not.
I see her as having her magic being tied to her life force. So while her magic is so powerful as to make her essentially invulnerable, if she cedes it and allows herself to become severely injured, the power of her magic will decrease along with it. Likely, this willingness to die (which went unchallenged by the characters and implicitly with how her "death" was framed, despite her serious mental health issues and suicidality being seen as necessary and fine because "she's just a bad person now") will drastically knock back the scale of her powers in future media. Likely, she will have to relearn them, this time in a controlled environment with outside guidance instead of DIY-ing and Darkhold-ing her way to god level status.
I imagine the White Vision returning, as well as Dr. Strange and the Masters of the Mystic Arts, and maybe the Wakandans (as they've been known for providing amnesty to superheroes before), Agatha Harkness, or Professor X. Perhaps a conflict between characters trying to be empathetic and help her (either out of genuine understanding, or a desire to prevent a corrupted Wanda situation again), and wanting to get rid of her because of the potential for future danger.
A proper ending to her story would be giving back her autonomy by letting her decide her path in the future, which I'd guess would be using her powers from the Mind Stone to erase her own memories along with Vision and craft a new life story, letting Dr. Strange cast a spell to severely weaken her (cutting off her powers into dormancy), and letting the Sanctum save the memory of her among a select number of responsible Avengers and Masters of the Mystic Arts while erasing her from the minds of everyone else due to the volatility of her power. She could start over and repent by refusing to have the temptation to cause harm, and trying to do good on a human level (Sokovian humanitarian aid, maybe). She could retire from superhero/villain life with Vision, reflecting WandaVision but without the bad stuff and mind control.