My grandmother is completely mobile and uses the bathroom unassisted. Problem is she sometimes makes a mess on the floor when urinating. I think she either doesn't sit far enough back or she gets up before she is done and the urine leaks out in between the toilet and the toilet seat. Is there a product out there that eliminates this gap or maybe a differently designed toilet seat? She doesn't need a seat riser as she can easily get up from the toilet on her own.