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Enalapril is an angiotensin converting converting enzyme inhibitor used in dogs with heart and kidney disease, especially those with hypertension. It decreases the workload on the heart.
Luckily it is a drug with a range of proper dosing, and can be given twice daily if needed. So while your pup may have received a higher than usual dose it may still have been within dosing guidelines.
The usual dose of Enalapril is 1/4 mg per pound of body weight once or twice daily. She received 5mgs, which would be appropriate for a 20 pound dog once a day, or enough for a 10 pound dog split into two doses. While I understand that she likely received the doses close together, she should not have an long term effects. You may see some lethargy or weakness but I would not expect any long term problems with a one time accidental double dose.
Please let me know if you have any further questions.