Is there an alarm watch that can be worn, not fringed ones, to detect when nasal cannula comes out of my mom's nose?

My mom has copd and is basically in last stage as heartbreaking it is for me to say. Lately when she is asleep she wakes up with her nasal cannula out and don’t even know how long it’s been out. It’s been happening every night I’m baffled that the concentrater doesn’t have some type of alarm that goes off when the cannula comes out. I’ve been searching for weeks and just need a watch preferably that has a sound alarm on it to go off when it comes out n her oxygen drops I’m so concerned and frustrated that I can’t find anything for this serious issue.