When do I give up?

Is your nephew your POA?
Do you legally need a POA at this time?
Can you manage your own financial affairs? Your own medical affairs?
Are you cognizant? If so you can change POA if he is POA and you do not wish him to be making decisions for you.
Do you need help with ADL's (activities of daily living) help with personal hygiene? housecleaning? laundry? dressing? bathing? Can you safely live on your own?
If you need help with any of the above and more then an Assisted Living Community is a good idea.
If you are cognizant and want to change your living arrangements then you can do that. BUT if you need ANY help your daughter, nephew and any other family members would be the last people that you should call.
If you need any help it might be best to accept that an AL community is the best and safest option for you.

Such communities usually have an omsbudman whose job it is to make sure residents' rights aren't being violated. Ask the management at your community to see the ombudsman, who will come to you. Then explain that you have been wronged and let the ombudsman take it from there.

What would be your choice for living arrangements?

If you do need a certain level of care and cannot live alone,
who would you want to assist you in arranging this?

Since it won't be your daughter.

Are you going to return and add answers to your post?

You had to have given your nephew POA unless she went to court.

Did either of those 2 things happen?

I can only guess that you and your daughters issues go way back and well before your crying phone call, so I would say to just get on with living and enjoying your life where you are and not waste time worrying about something you have no control over.
Your daughter has made her choice and that is on her, not you, so hold your head high and get on with living and enjoying this one life you've been given.

Others are correct in informing you that if you are not cognitively impaired then no one can legally keep you in a facility. You must have given one or both of them the legal authority to manage your affairs, however was the Power of Attorney durable (authority goes into effect immediately) or springing (requires at least 1 official medical diagnosis of sufficient incapacity)?

We are only getting your side of the story here. If your daughter could tell her side, what would she say about you and your relationship? FYI even if she is your PoA, she cannot transfer that authority to another person, only you can do that (assuming you have legal capacity to do so).

If she's blocked you, take the hint and stop hounding her. She knows where you are and will come to you if and when she wishes to reconcile. Go about making the most of your daily life and stop waiting for her. Make new friends, learn new things.

If you have your mind and your mobility nobody can put you in a nursing home! Please consult an attorney. Something is fishy.

Reconcile with her? She put you in Assisted living?
Can I ask who you made POA over you? Is that the Nephew?
Did you go to court?
Did a doctor assess you with dementia?
Are you able to get around and care for yourself?
Do you have a social worker or doctor at your ALF who you see?

I truly don't understand all of this. It could be that your Nephew is the one in charge, and it could be your daughter is the one in charge, but if YOU are NOT in charge, then they would have to have papers from your doctor saying the being alone at home is no longer safe for you.

I can only suggest, since you are well spoken on the computer and clearly computer-literate, that you consult an elder law attorney and ask to see him in office or have him come to your place to see you if physically you cannot get to him. He will check all of this out for you.

As you can imagine, a Forum of strangers from around the world can't really be of a lot of help to you. You have my best wishes and I hope you will update us.