The best plan for now may be to shut the Morki in the bathroom whenever this happens again until the whole
seizure is over and your other dog has recovered. Just shut her
in in a kind but firm way, tell her to 'stay' and 'wait' with a gentle and steady voice. And don't let her out until you are sure the crisis has passed.
I presume the vet knows about these seizures? Has any medication been prescribed so far?