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Hello. I'm sorry to hear about your dog.
The most likely cause here is low blood glucose (hypoglycemia). To help stop the seizures at home, you can give Karo syrup orally. I would give 1 teaspoon at a time every 5-10 minutes until they stop and she is up eating on her own.
Going forward, try to feed her 3-4 times daily until she's 3-4 months old and able to maintain her blood glucose more normally.
If she doesn't come out of the seizures within an hour, then you really should go to a vet to run bloodwork and confirm the hypoglycemia and treat more aggressively.