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Well, at this point you will need to see a judge to have her placed under guardianship.  The paperwork may be something you can do on your own if you contact the court.  But there are also lawyers who will help, including specialty legal services for elderly and estate planning.  There are a lot more issues to think about besides a tax return.  Medicaid asset protection.  End of life/living Will/health care proxy.  Wills and inheritance.  Etc.  This could have all been taken of when she was still competent, now it will be more difficult.  Hopefully she made her wishes clearly known before she became too ill.  I strongly recommend you see an elder care attorney.  There is a lot you need to know and plan for.