She wants to sit on the couch all day. She does PT three days a week for 30 minutes and does great, but at home she wants me to do everything for her. She will sit on the couch until she can't make it to the bathroom and then has to be cleaned up. I encourage and suggest bathroom trips and she declines and then when she doesn't make it she gets emotional and acts like it is my fault. I have even tried getting her to sit closer to the bathroom so she doesn't have so far to go.
You have a small child in your photo, would you allow a toilet trained child to soil herself? If I were in your shoes, I'd be starting a bathroom schedule, every two or three hours whether she feels like she needs to go or not. Relying on her knowing when she needs to go isn't working so well. Sounds like encouraging and suggesting she go is resulting in a lot of work for you. She may not be happy with a schedule but right now she's upset when she doesn't make it to the BR. She can blame you for the schedule, instead of the accidents.
If she refuses to get to the bathroom on time, put her in pull-ups for adults. I'd also get her going to the bathroom on a regular basis, every two or three hours. If she says no, go over and take her arm and escort her to the bathroom. No choice for her. If you've got to clean her up, then you get to call the shots on her behavior in my book. And try to figure out when she has issues (like two hours after drinking or eating) and escort her to the bathroom shortly before that time.
As for not wanting to do anything, if she doesn't have cognitive issues occurring, just quit doing stuff for her that she can do for herself. Maybe she needs to be around other people in a facility, if she's lonely or depressed. She's still too young to be vegetating unless she's got brain issues starting.
This lack of adequate notice from the body does in fact happen to people -- I don't know if can be caused by strokes and I sure don't know if that is your aunt's problem. (I kind of doubt it.) But blaming that would be a nice face-saving way to allow her to accept the need for scheduled bathroom trips!
If she has low vision, is she interested in reading? Your local library should have large print books or even devices so she could read (if she likes that).
Maybe you need to ramp up your "encouragement" of the bathroom trips. Maybe they need to become a requirement. Every two hours you help her to the bathroom. If she doesn't have to go, fine, but she has to sit on the toilet. Present this to her as a favor to her. You are willing to keep track of the time and help her to the bathroom in order to avoid that emotional distress of being wet. It is not a punishment -- it is a benefit!
Does she watch television all day? Set your timings between shows.
I hope she is wearing disposable undies!