All she needs to do is call and it'll be resolved, and that's been said a number of times
But I do have to correct your point. Which I know through my job 
If Mr Smith at 1 the terrace had a CCJ against them the CCJ would be against MR smith. His address isn't utterly irrelevant to that process- it's up to the creditors to find Mr Smith and get their money.
The creditors will find an address of 1 the terrace and will visit that property. To find MR smith. 1 the terrace is nothing more than a known location- the house has no credit data whatsoever against it.
When Mrs Jones moves into 1 the terrace and applies for a credit card the company search for Mrs Jones' credit history to make a decision. Mrs jones at previous address and previous names. Her current address is tagged to NOTHING- that's all Mr Smiths problem.
Do you really think creditors are stupid enough to decide Mrs jones is a high credit risk because someone with a CCJ used to live in her house?!
The only time this could be an issue is a company who doesn't know that a previous occupier has moved. Ie, if the gas and electric was cut off for non payment the new occupier might stuggle to get it reconnected without proving they are unconnected to the previous occupiers. However that is not credit- that is gas and electric.
None of this changes the fact is horrible, for anyone, to have baliffs at their door looking for someone who no longer lives there. That's why there has been advice to call the police when they arrive and refuse to engage until the police are present.