Hi Help_WifeIsCrazy,
Welcome to the BPD Family

I come at BPD from a slightly different angle, my significant other (SO) has an undiagnosed BPD ex-wife (uBPDxw).
I actually discovered BPD by Googling "Chronic Lying". I'm glad to hear your reading about BPD, that's what I first did as well, went to the library and hit the books.
For folks with BPD Feelings = Facts and I have seen this manifest itself with my SO's ex. Her lying is a slightly different flavor than your wife's, she lies most often about money related stuff.
She has told her daughters that she is buying a half-million dollar home at the same time she's being evicted from the 3 Bedroom Townhome she couldn't afford. She sent their older Daughter of to college with the promise that her Family Trust would pay the college. (Dad warned D18 but she was shown documents that she believed) So off she went to college, and now she owe that College $15,000 because there was no Trust.
I think she really wanted the house for her kids so she believed she was going to make it happen and I believe she wanted her daughter to go to college out east so she believed she could make it happen. They were both lies, and very damaging to her children, but the sad thing is I think they were a twisting of her hopes and they turned to failures, because feelings don't equal facts in the real world.
In terms of your wife's stories, they could be true, they could be what she feels is true so to her they are true, the stories could also be to get a reaction out of you... .maybe trying to make you jealous for example so she feels certain you love her.
Panda39