First, I am sorry that you and your family are suffering from this disease.
I suggest that you make the bedroom more exciting so that she gets her rush from her time with you. That might, and I do say might, cause her to lose interest in the chatting. Talk to her about how it makes you feel for her to chat, and talk about ways to make your time together exciting. Involve her imagination and your imagination, and see what fun you can have. Suprise her, be bold and try things you never would have before. I am reticent about being explicit here on the forum, but I expect if you use your imagination, you can capture her interest. Give her reason to be thinking of the time she had with you, and the next time. Stir her imagination so that the chat becomes less appealing.
Again, these are suggestions taken from my own life. Hopefully, your wife will not balk at the meds when she stops having the mania highs. Because correct dosing will control both the highs and the lows. Sometimes I think I miss the highs. But I remember the bad side of them and am glad to be controlled.
Most of all, hang in there. Keep on loving her, because she needs that more than she can possibly express to you. My husband has shared how hard it is to be the normal one trying to deal with someone you love suffering like this. But he and a lot of others have survived, and have strong marriages.
Keep coming here and sharing and asking questions. This is a great group, full of information, and advise.
Fibromyalgia, Bipolar II, Post Traumatic Stress Syndrome, Clinical Depression, Arthritis, High Blood Pressure, etc.