Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before.Different experts come online at various times; I just came online, read about your situation, and wanted to help.
I am very sorry to say that if her teeth are loose, then the chance of saving them are slim. Once a tooth has become loose in its socket, there is not much that can be done. There are no real treatments to address this (not even for people). If she previously had poor nutrition, then feeding her a proper diet so that her body can care for its own gums/teeth can potentially help. But otherwise if her teeth are loose or even worse covered in tarter or rotten, then she may need a dental to remove those teeth that are compromised. That said, while that will sound daunting and would be terrible for a person, dogs do really well even without teeth. She may need a wet food diet afterwards (though many dogs are just as happy to keep having kibble with minimal crunching/chewing), but Molly can live a normal long lived life even if those teeth are beyong saving.
Overall, there isn't a treatment that will repair the loosening of teeth. Good nutrition can help if it has been lacking. But no matter what, it is a case of seeing how she is with this. If those teeth are causing her to struggle or causing pain, then they need to be addressed. Otherwise, you can monitor them but be prepared that loose ones could fall out on their own with time.
Please take care,