Ok lets use some common sense here.
You have a beardie who if like other beardies has a long coat that can get tangled easily.
Any type of grooming would be uncomfortable for the dog so the dog has already learnt that however gently you are grooming it is uncomfortable. Not rocket science so far
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Believe me your dog could have drawn blood if they had wanted to - so actually they were quite restrained and for that you should be very grateful and be aware that you have a very scared dog.
You do need to desensitise and it can be very easy to do - you could also have the beardie clipped short if grooming is a major issue.
So get a very very soft brush and hold some lovely smelly treats in you other hand with you hand slightly closed. Let the dog get the food from you hand but make them work to do it - at the same time move the brush in pretend brush strokes over the dog - do not touch the dog. Then stop do this as many times a day as you can by the second day I am sure you will be able to gently put the brush on the dog and then move on with this each day. Any sign of anxiety then go back a step. Do not do it for more than 5 secs each time but soon you will have a dog that loves grooming.
Next step to move to the bathing. If you use a bath stand dog in bath and treat get dog out of bath, stand dog in bath touch tap and then get dog out of bath etc.
It takes a little time but once sorted you have a happy dog that will love grooming.
Re ear drops if you start to get your dogs used to having ears looked at as a puppy this is never an issue, so daily you should look at dogs teeth and eyes, paws tummy and ears. I even get my pups to wear a plastic collar for a while so nothing will phase them when they need vet treatment.
But if you have an issue as you do with ears then lift the ear flap whilst feeding liver etc do this 100s of times a day and one time pop in the drops the dog will soon lurrve to have his ears done.
Do not tell your dog off for snapping she has no other way of communicating her fear and discomfort. She does not hate you, she still loves you etc etc, It just hurt her