Hi testathon. This is only regarding uni- vs. bilateral electrode placement, and memory loss in general. Over the course of about 10 years, I've had 70 treatments. In all of them, the leads were placed bilaterally. I'm not sure I've heard of anyone having unilateral, but that's probably because I don't know many people who've had it. Regarding memory impairment, it's been fairly severe. Mostly it's been my autobiographical memory, and then long-term memory. And although my short-term memory seems ok, I have trouble moving things from short- to long-term memory. Re frequency, I was often hospitalized for two or three weeks for every-other-day treatments, but I eventually reached a point where I only needed one-month maintenance treatments. In its defense, I have to say that it was very effective for me, maybe even saved my life. But sometimes I wonder if the cost to my memory was worth it, that maybe we should have just kept trying other treatments. Although I am said to have 'treatment-resistant' depression.
Anyway, that's just my experience. I'm not trying to say that your partner will have the same issues. I'm glad to hear it's working for her now that they've found a way to get her to have seizures.
Good luck to both of you!