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It sounds like you are pretty much on top of things. I would withhold food for 12 hours to give her stomach time to rest. I would also substitute Pedialyte unflavored for water. You need to push fluids to encourage hydration. Substitute the pedialyte for the homemade recipe you are pushing now. If she's able to keep the pedialyte down, you can start her back on the boiled chicken you've made. If she can't even keep the pedialyte down, then I would be very concerned about an obstruction of some type and would advise going to the emergency clinic. The only thing that I would consider giving her would be Tums or Mylanta....Maalox would be another option, but most over the counter products are not safe for cats.
Please let me know if I can help further and how she's doing.