Hi -
I'm in your area (Milwaukee). We don't have the clamps you need, but we have had some problems getting the tube to stay connected at night. We've got lots of extension sets for a Mic-Key button, both with Y ports and bolus ends. We generally don't have a problem with those disconnecting. If this helps, PM me or email at gtdrax@nconnect.net. I'll get them to you tomorrow.
I know, all too well, that feeling of frustration when you can't get the thing that's supposed to help to work correctly. I also understand the worry about her missing a few nights, or even a portion of a few nights...I hope you can find a solution soon.
Another thought. Have you tried Walgreens Home Care in Wauwatosa? They always seem to have the obscure things that we need. I drive by every day and if they have what you need I could pick it up on MOnday and get it to you Mon. night. Their phone number is 888-256-7234. I'll PM you my phone number so you can contact me if they have it.
Boy...I sound kind of psycho offering to pick it up for you, huh? I"m really not...I just felt my stomach twist in a knot of frustration when I read you post. Let me know if I can help.