My sister has epilepsy but she wants to start getting her driving liscence...?

what's the amount of time you need to not have a fit in MD?

it varies from state to state, check with your secretary of state. good luck

I believe it's 3 years seizure-free. Check with the Maryland DMV:

http://mva.state.md.us/
I see it like this if she wants to then she should but as long as she is not alone when she drives and she has to mantain taking her meds.
In my state the people have to have a sworn note from their doctor that they are doing measures (medicine) to control their seizures and that they cannot have a seizure while driving. Check with the bureau of motor vehicle in your state. I am sure there are similar guidelines.
i have no idea what it is in MD, you should call the DMV or ask your doctor. i know in MI it's only 6 months...
my friend was just found out she has epilepsy.
The most common requirement for people with epilepsy is that they be seizure free for a specific period of time and submit a physician's evaluation of their ability to drive safely. Another common requirement is the periodic submission of medical reports, in some states for a specified period of time and in others for as long as the person remains licensed.

Unfortunately, some states only require a 90day seizure free period. If she's a decent person, she wont risk endangering other people if she's prone to seizures.