Just a thought......you said she's in her 60's.....sometimes early onset dementia can start about that age....& it does take a very similar form starting out as to what you are experiencing with her.

No matter what the reason...I would definitely keep my distance from her as it's too difficult to tell what is & isn't the truth with people like that....best to stay away IMO.

Have had other people who are just drama queens who love to make up stories in their imagination & make them sound real because there is no way of actually proving or disproving what they say....which is why they can get away with it for so long