14 yr old F dachshund - Severe seizure - Recovery time

Question
Our 14-year-old female dachshund had a seizure event that lasted about 15 minutes.  She's a very lively and active dog, and it was her first seizure ever.  She was on the floor when we looked down and noticed she had defecated and had gone rigid.  Picking her up, she went limp and stopped breathing.  She then went rigid again and then semi-rigid once more, during which she vomited and groaned loudly, and then very slowly regained consciousness.  That was three days ago.  Our vet has tested her urine and blood, both with normal results (with the exception of a slight liver elevation in the blood) and fears a brain mass.  Three days after the event, she remains extremely timid and hesitant and is sleeping more than usual.  She's able to walk OK, but she's unable (or unwilling) to shake herself out.  She perks up a bit outside but nowhere near her normal self prior to the event.  We don't know whether she just needs more time to recover and should expect her to return to relative normalcy or if her actions should be taken as indications of a more severe situation.  Your opinion is appreciated.

Answer
Micheal,
I am very sorry to hear this about your sweet dog. However, it does not bode well for a 14 yr old dog to have this kind of seizure.

It is most likely not an epileptic seizure, but one from a mass. The sleeping is a possible sign of this pressing on her brain and causing her to be less 'there' than she was before.

She may yet recover and it not be a problem, but you need to steel yourself for the worst. I am sorry to say that but I have never seen a dog this age get better from this severe of a seizure when it was clear the dog didn't already have epilepsy.

So watch her closely as dogs like this tend to wander off after a while and get hurt if she isn't closely supervised. While I can tell she is, it is just something to be aware of.

If you have the next inevitable questions, what do we look for, then I will tell you now.
She will withdraw more and more and may have more seizures. She may not.
She will sleep a lot and will eventually lose interest in her food and the family. When she stops eating she is then telling you that it is time.
Now it might not go that smooth. In these cases sometimes they go into massive seizuring and it cannot be stopped. So please realize that there is nothing you can do at that point except stop her suffering.

You may have to make a hasty decision so it is good if you can discuss it with your family now and then if that happens you will be ready and will feel much better about the outcome because you were prepared.  

You will give her a gift for all the years of love she gave you. She will be at peace and you will miss her but it will be softened knowing you were there for her until the end.
Bless you and your little girl. My prayers will be with you.