Firstly, welcome to the forums I hope you find what you're looking for here.

I think it would really depend on what her symptoms are and the effects they are having? The best thing I would suggest you can do is be there for her as much as you can but also be honest. If you can, talk to her about what is concerning you and ask her what you can do to help her get through this time. Together you might be able to come up with a plan to help manage some of the symptoms.

Also, if possible remember to take some time for yourself. It is great that you are supporting her but make sure you still look after yourself as well.

Good luck I really hope that when she has her next doctors appointment they can help.