How To Convince My Mom To Move Into A "retirement Home" Near Me?

I feel like this is perhaps redundant given the other posts here, but ....

My mom, 83, lives 8 hours away. Her husband, my stepfather, died in early August. She's now in the house by herself, refusing aides. She was diagnosed with dementia (I've been trying to read up and I think she might be mid-stage now) but is in denial about it.

Thankfully, my stepfather had already been talking about them moving into independent living, so she's on board with the fact that she needs to move out of their 3-bedroom house. What she doesn't know is that she needs to move into assisted living (I keep calling it a "retirement home" bc she seems ok with that term).

I've always had a challenging relationship with her as a result of a challenging childhood and she's been quite mean as I've been an adult. My older sister lives 15 minutes away from her and hasn't talked to her or me in 20 years, so it's just me responsible for my mother.

Here's what I'm trying to figure out: I just found an AL that might have an opening in 6 weeks. But now that it's getting real, my mother is saying that she couldn't possibly move that soon, because:

1) She needs to pack up her house and sell it. There's no way in hell she can do this. I've told her numerous times that she just needs to focus on deciding what she wants to take with her and that I'll handle the rest. (Honestly, I will call a estate company to just empty the house after she's out -- I'd have to quit my job to do it myself.)

2) She doesn't want to move by me because I haven't called her in a month. Instead she wants to move someplace close by to where she is. In reality, we talk every day or two. And I absolutely cannot support her if she's 8 hours away -- I can't go down there all the time, I still have a kid at home, I have a job, etc.

How am I going to get her to move??? I've told her plainly that she needs to move before there's a crisis -- something will go wrong with the house, or she has a medical event. I feel bad for her, I know she's really depressed, I know it's a ton of transitions, but also literally there's no other choice. How do I get her to go along with the plan??? Really appreciate any ideas/tips/advice you all might have.