I Have A Step-daughter That Is 57 And She Has

I have a step-daughter that is 57 and she has seizures. She o.d's every couple months on Norco, Baclofen, or whatever she can get enough of to get high , then ends up in the ER to spend 2-3 days in the hospital. She takes Kepra for her seizures, and does all this on top of this. She also smokes pot, and I was told that the THC in the marijuana stops the Kepra from working, along with the opiods and muscle relaxers (baclofen) that is prescribed to her by her DR. I think she has a death wish, and this is really taking a toll on her father(83) and myself, as she lives on our property in a studio apt. off our garage with her husband. Please advise. And he is also beside himself over this. YYYY@YYYY Does the THC in pot stop the kepra from working or being effective?