Then she smiles and smirks like it is her right to do that. She says she loves me. She lies to my dad about me and she caused a rift between me and my brother before he died. My 3 brothers are all dead so I am alone to deal with her. Can I walk away. She and dad are in their 80's . I have had to take anxiety pills now just to keep calm. I just want to walk away
You have to do what you feel you need to for their care, but it sounds like keeping as much distance as you can would be good. It will give her more time to make up good stories about you. Don't let her get your goat. It's not worth it.
What sort of support do your parents need? Does it have to take you into frequent contact with them? There are always other options. As long as they are looked after, you sit tight and care for your own family - they're the ones who really need you.
Curious, what does your Dad say about this? Are there other things that your Mom is doing that seem off kilter that your Dad is noticing?
It MAY be better for your own peace of mind, however, if you take some responsibility to see that they are safe and cared for, without actually doing the caregiving yourself. I don't recommend total abandonment but doing what has to be done from a distance. This seems to be a long-standing toxic relationship. Don't plunge yourself into that environment. Handle it at arm's length, perhaps through a social worker or other professional.
Are you in therapy along with taking anxiety pills? I think talking to a counselor is an excellent idea.