86 year old Mom has to go into rehab following heart attack. Should we give all her financial info as we are being ordered to do?

She is in hospital awaiting bed at rehab/nursing home. Family and patient given form to fill out about all her assets, etc. Family and patient are fearful. Yesterday family was told if we don't comply she will not be discharged from hospital and will have to pay $ 900.00 a day or they will put her in a lesser quality rehab further from our homes. She is insured thru Medicaid and Independent Health for Seniors as far as she has told us. When our Dad passed away well over 6 years ago, her deed to house was signed over to her son and daughter. They are asking for banking info, any life insurance info, assets, etc. Should we just fill this out to the best of our knowledge? We feel nervous and cautious because they never sat down to explain. Just do this or else. Mom is fearful because she has heard horror stories of other seniors losing everything when they needed rehab or nursing home. Prior to heart attack we did a lot of caretaking in home after a fall and also had a lot of help with part time Nursing, aides, pt and ot. She had fallen May 1st and needed a great deal of help to be able to walk again on her own. I guess I am asking if this financial form they are wanting filled out..is this standard? Should we just do it or should we get a lawyer? Any info would be greatly appreciated..