Juni does that from time to time, not too often now. I used to feed her with dry food and add once in a while some canned food. I stopped feeding her dry food and I won't go into details about my idea about it, I feed her now with boiled fresh chicken, or fish or beef. On occasions, I buy some canned food. She rarely throws up now.
I dared to buy some dry food (her used to be favorite) this summer and gave it to her. I believe she threw up absolutely every piece of dry food. Then she ate again and the same story. I never gave her again.