No, your employer is just exercising their right to let you go because it is convenient for them to refill your position with someone who does not have health issues, or because they need to drop a position from their payroll due to the economy, or because they don't like you and want to take this opportunity to get rid of you. It can be any of these things, believe me.
I wouldn't try to get my doctor to release me too early. No matter what, you're going to need adequate time to heal, your company does not in any way have to accomodate your disability, and they probably will not go along with your coming back in a wheelchair or any such thing even if the doctor does release you to light duty. They would be worried that you might fall or injure yourself while at work, which would be a great negative to them, as you might then in some way hold them responsible for your future problems.
You are very lucky that you worked for a company that has disability insurance at these good percentages of your pay. In many states, working for many companies, you get nothing at all while you are out due to a non work related injury, and then may lose your job for absenteeism when you are unable to come to work. It sounds to me as though your supervisor was pretty nice to you, actually. Her supervisors may now be telling her that she needs to get rid of you. In any case, what has been done for you has been much nicer than it legally needed to be.
Unemployment, which remember, we are telling you you will not be able to get until you are fully released by your doctor, is going to be something like $428 a week, provided you qualify for the maximum Utah state benefit, which is based not on your last 3 months of employment at all, but on the base period, which is about the last 18 months, where you have been working and how much your wages have been.
It is NOT going to be paid by your most recent employer in this case, though they will be paying unemployment taxes to the state, and their taxes may increase due to your being approved. But this is not a significant negative to them in this situation.