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Hi, I can help you with your question.
No, it is definitely not normal for a dog to remain in heat for 4 months.
What are you seeing that makes you think she is still in heat?
Are you seeing any discharge from her vulva?
How old is she?
Was her April heat that the first cycle that you have observed?
I see. Although it is possible that she still has an abnormal influence of estrogen, it is more likely that you are seeing her new "normal". Her first heat cycle will cause swelling which may reduce after estrus, but she will never go back to her previous size.
Even after being spayed, her vulva will remain somewhat enlarged compared to her juvenile size. Your vet can confirm that she is not actively in estrus by checking a vaginal cytology under the microscope. Please let me know if you have further questions. I am happy to continue until I provide the service that you seek.