Good Morning and welcome. I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
I am so sorry that Poppy is suffering from this condition....something has frightened her that you may not be aware of and now we need to work with this.
This is a common trait in some dogs. They develop fears that cause extreme anxiety similar to those anxieties of humans. The only way to get Poppy over this is "Desensitization" which means constant exposure until she realizes that these fears will not hurt her. To do this, first avoid these while making Poppy comfortable in this situation. You may need help in doing this since when you try, as you have experienced, she is too afraid to understand. Purchase a DAP Collar at the pet store. This is a canine pheromone that acts as a calming agent and will decrease anxiety.
Thundershirts are useful since this is one of the most common fears causing extreme anxiety and can be very effective.
If you are peristent, Poppy will get over this.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please Reply so I can clarify for you
Sincerely, Dr. Loretta