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Without further information it is very difficult for me to provide the best advice but I shall certainly try.
Please reply when you can and we can continue the conversation.
If this has been going on a long time and she has no other symptoms we may be dealing with a food sensitivity or Bilious Vomiting Syndrome. Consider feeding little and often, ensuring she eats before bed and on waking and offering a hypoallergenic diet.
If this fails or she has other symptoms, a vet visit is best.
They may consider a trial of medicine such as ant acids and/or anti nausea medicine.
Alternatively, if concerned, they will advise tests such as a blood test and abdominal scan to determine what may be going on.
I hope this helps and please let me know if you have any further questions,