Mom has 4 delusions now, most costing me and money. How do I handle this?

Mom is 84 now, living alone out of state. I talk on the phone with her every day. She passes the cognitive testing in the doctors office, but I know she has dementia with up to 4 delusions currently. Because the doctor hasn’t deemed her mentally incompetent, she is of her own accord. She seems fine half the time, then one of the delusions enters the conversation. Here’s the list:

1. Her teeth are rotten in the front and she needs them fixed. I spent hundreds of dollars on dental insurance for her because I thought she needed a lot of work. Nope, not one cavity. Dentist says she looks good. There’s discoloration between the teeth, but not cavity. She wants to go to another dentist 😩.

2. From the past going on for years, bugs in the carpet, going on her, going in her body. Multiple pest control coming, finding nothing, charging fees. She bothers the management as well of this issue.

3. Paranoid delusion, the man next door is on her iPhone, he listens, he changes things on it, and is a basic scapegoat for everything she can’t do on it.

4. Me, I’m against her, I don’t stick up for her, I don’t believe her. I’m basically her only support.

I would really appreciate any suggestions. I realize there is no medication for this and it stems from dementia that she’s not diagnosed with yet, but I don’t know how to handle this craziness and not fork over more $ on needless situations. Ideas?