I can't even begin to tell you how said I feel for you. You need to do what makes you feel better. As many people said here, you may never find out. Do what your heart tells you.
I don't know anything about Lola's health but my bully Dublin has severe seasonal allergies and has had awful reactions. She was due her shots a few months ago, but my vet ( Dr.Koch in Sarasota FL) won't give her the shots as he is unsure of how she will react because of her allergies. Now she has had her previous shots and was fine. She does have breathing problems and has had soft palate and nasal surgery so she is an extreme case. Otherwise she is in as best of health I guess a bully could be under the circumstances.
I worry about her not having her shots but I trust my vet to make that decision so I have to weigh not having the shots versus the protection they can give her.
You did everything right for Lola and that is all you could have done. It doesn't change the pain you are feeling right now but hopefully in time you will be at peace with that. Please take care of yourself.