Cerebral Palsy, Gagging Problem, Recurring Problem, Reflux Problem
The question here is whether there are any factors which precipitate the gagging episodes. It is true that postnasal drainage could contribute to this and sometimes over the counter preparations may be of some use in limiting the production of mucous. There are prescription inhaled steroid medications such as fluticasone or Flonase which have been used successfully in limiting postnasal drainage which you might inquire about from her doctor.
Another question is whether she has developed some degree of difficulty in swallowing or clearing her oral secretions. This could be checked via a swallow evaluation which is performed usually by a speech therapist. If it is the secretions which trigger the gagging, maybe you could evaluate her diet to see if there are certain foods such as dairy products which cause her to generate more secretions.
I hope I have adequately addressed your concern. I am available for your followups.
1) Lansoprazole (sometimes referred to as Prevacid)
2) Ranitidine (sometimes referred to as Zantac)
3) Famotidine (sometimes referred to as Pepcid)
Any of these may be helpful. It takes some days before you can tell if she has benefit - at least 2 weeks.
I wish you and your daughter optimal health! Thank you again for your query.