Hi Willi8:
Welcome!I'm so sorry about the situation with your daughter.
She uses my credit card and is putting me in debt but has such tantrums I can't stand up to her. I am 79 years old and widowed. I live on a small pension.
You have to stop her from using your credit card and just say "no" to her requests for things like "ozone machines". It will be endless, if you don't set boundaries.
At 79, you are vulnerable to be a victim of elder abuse. Do you have a close friend or relative that you can turn to for help? If you belong to a church, perhaps someone there?
It would be best to have a safety plan in place. Does she ever get physically abusive? Regardless of whether she is physically abusive, mental abuse and financial abuse are generally taken seriously as "elder abuse".
Do you live in the U.S.? Perhaps we can help you find an "abuse hotline" to call & perhaps you can gain some support on how to deal with your daughter. You may have to get her out of your home, which could require an eviction procedure.
Is your daughter diagnosed with BPD or other mental illness?