I'd be extremely surprised if anything exceptional (petition for bankruptcy or declaration of insolvency, home repossession) occurs from this.
It costs money and time for creditors to take court action. She must owe an awful lot - however it's highly unlikely they will continue to ask for money if she has no tangible assets or cash in hand to take possession actions on.
I'm aware I've done a couple of tldr thread posts on this site but on this occasion I actually have reasonable experience as I work in the debt industry. (P-P-P-Powerlevel!)
We all know they have no assets. The property, a shithole, is in negative equity, and possession and sale of the vehicles and personal plates would be more trouble than its worth.
Both are vulnerable, legally speaking, and I can't imagine Capital One collections being able by federal or state law to enforce possession or payment orders on an autistic pants crapping crossdresser and his geriatric haggard death's door mother.
They WILL be able to put the equivalent of a CCJ on her record however, preventing her from taking any additional credit out. They might write the debt off if the Chandler's genuinely have no spare money but they may also be able to take cash directly from Snorlax's tugboat if they can reasonably prove that they can maintain themselves on a budget, with token payments on a monthly basis to evidence futile repayment - depending on if the law permits this.
Basically she'll get a permanent flag on her credit record far, far too late into her life when it'll mean next to nothing. This will only affect Chris and Barb as much as they will be entirely reliant on their tugboats with no ability to use credit for the foreseeable future, if the courts declare them insolvent.
So we can all look forward to more and more desperate begging videos and Chris deteriorating mentally even more as he realises his access to lego and Pokemon has become limited yet again.