Not sure if this is appropriate thing to say or not but here it goes.

It sounds like her brain is getting in the way, the same thing happens to me from time to time So my suggestion to try would be (after talking to her doctor and getting the appropriate prescription, not trying to promote inappropriate drug usage) something for anxiety might do the trick. For me a bit of Xanax (generic of course) usually keeps my mind from thinking too much at JUST THE WRONG TIME.