Veterinary questions? Ask a Vet for Answers ASAP
It is hard to say for sure, but there is certainly more than just drops, which is good.
Most dogs pass urine about 3 to 5 times a day and, for a dog of her size, we're usually looking at about 20 to 40mls of urine per kilo per day. For a 35kg dog (for example) this would mean about one litre of urine over the whole day.
It seems to have enlarged so the sooner she can be seen the better.
You can clean it with salt water and apply a lubricant such as KY jelly or vaseline.
Use a buster collar so she cannot lick it and ensure no other dogs are trying to get to it.