Bipolar and weed

Does anyone’s SO self medicates with smoking weed? Her and I usually smoke casually to relax and have fun on weekends etc. but one of the signs she’s not doing the best is she will significantly ramp up how much she smokes. Does this impact her negatively enough to seriously consider stopping? I’ve read that it’s not great for anyone who has been diagnosed bipolar but I also see many stories where symptoms of this illness present themselves regardless of the presence of weed. So I worry if trying to take away one of her coping strategies is even a good idea, unless long term that really will be helpful? Anyone with experience or insight on this issue would be greatly appreciated!