Is there another adult in your life who is more sympathetic? An older sibling or cousin, an aunt or uncle, even a family friend.
I agree with the others: Echo is suffering. These seizures are not going away and are becoming more frequent which is a bad sign. Each seizure does a bit more damage to the brain and makes it harder to recover.
At this point you may be looking at euthanasia. You might have been able to control it had you got medical help as soon as you noticed a problem, but it sounds like your mother will not pay for medication to help control the seizures and it may be too late, too much damage may have already been done. It's not fair on Echo to spend the rest of her life having these seizures, potentially hurting herself during them, having to cope with the after effects and being disorientated and scared. This is not a happy, healthy way to live - or to die.