My daughter with sz has similar delusion, communicates by mental telepathy with a previous boyfriend and is also contacted by God on a daily basis to tell her she's Satan and is going to die. She wasn't like this before her relapse, she's on Abilify and Quetiapine but the medications have only ever made the voices a little quieter, they've never removed them completely. Her illness tends to go up and down so I'm hoping her delusional voices will weaken as she recovers and her mind grows stronger.
The mental health experts tell her to use distraction techniques to cope with her delusions and voices, so you could try that e.g. writing, music, tv, art, reading, cooking, playing a game, play the keyboard, do some exercise etc. If none of these work then we'll go for a walk or take her out in the car, or go out for a coffee somewhere reasonably quiet, or visit a small shopping mall or go to a park and just sit in the car people watching.
I'm no expert on bipolar (with psychotic delusions, and an eating dosorder) so couldn't say if your daughter's treatment plan is sensible. For sz, a medication like Abilify is continued because it helps to keep the delusions away, but maybe the Abilify was stopped for your daughter for other reasons.
We're told that anti psychotics take a while to get into or be flushed out of the body, and can take days or even weeks to become really effective. If this applies to Seroquil, Rexulti and Vraylar then changing things every few days doesn't sound like the best plan.