You will want to find a good products liability attorney. However, that being said, it may not be easy if the damages are not great enough to justify their expense and time. Don't give up and keep calling around.
Consult a wrongful death attorney. An Estate has been opened to presumably lay the ground work for a suit. The Letters of Administration authorize her to act as the personal representative of the Estate and do what needs to be done.
Hard to say without knowing any more. Usually your attorney is in the best position to give advice on settlement, as they have all the coverage information along with any potential asset check of the at fault party. Sorry to hear about your accident. It sounds like it was a bad one. I wish you a speedy recovery.