My niece had (Postural Orthostatic Stress Syndrome). She would just fall no warning. Her biggest symptom was syncope, she would feel dizzy some. Her blood pressure would fall and heart rate would go up.
Check this out
What type of seizures does your daughter have? I started having temperlobe seizures four years ago. I started a new medication the first of 6 that is actually starting to work. I have went 4 weeks without a seizure I normally have 3-5 per week.
I hope my info helps.
I gave you the wrong name, it is Postural Orthostatic Tachycardia Syndrome (POTS)
How are you? How is your daughter? What was the result of the MRI ? Are there other symptoms present with the change of seizure? If another seizure attacks, just make sure she has somebody with her all the time and she doesn't hurt herself or hit her head with something hard.
Take care and keep us posted.