Since she is an adult all you really can do is be there to talk when she needs you. my mom goes through alot worrying about me too. She used to try and do things for me but that only made our relationship worse because my problems are my problems to take care of the best way that I think they should be taken care of.

You can sit down with her and ask her if she wants your help in locating another doctor for a second opinion and possible therapy to help her cope with the many emotions and problems that living with a serious physical health problem gives her. and let her know you respect her judgement on what is best for her and want her to tell you what she needs from you.

after that talk you will know what she needs from you and help with doing and will be able to do what you can for her.

as an adult though all decisions and options are up to her now. She's the driver and you are now the supportive passenger in this ride. It may be at time a rough ride where you will at times feel helpless but you and your daughter will be fine as long as you are both letting each other know what you need from each other and let your daughter make the decisions for herself.

hang in there.