We think mom had a stroke 5 months ago, and won't see a doctor. How can we get her to go if we don't want to be the "bad guys?"

Mom has lost her balance, cant sleep more than 3 hours at a time, and her memory is nothing like before. she was sharp and witty and is nothing like that now. She stares off into space for long periods (30 minutes or more), she stands in her kitchen doing nothing for hours, she has forgotten how to do things she has done 50 or more times, When were over her house for Sunday dinner, we are all sitting ready to eat and she has to be told to come join us. Most recently (and definatly the scarriest) she drove off the road! When she called us and all she said was" I have a flat tire"! She was driving on a straight road, no turns, when asked what happened she said I guess I didn't turn back enough! Dad can't get her to go to the doctor, and dosen't want to be the "bad guy"
Any thoughts on how we can get her to be seen by a doctor would be greatly appreciated. THANKYOU