8 pages on a topic that seems pretty easy to solve and has already been answered probably more than once. :lol:

Take her phone/change the code to the alarm and watch for incoming message and or call the freakin' alarm manufacturer and get the answer to how this happens as far as it calling/texting her phone.

If they don't have a set of instructions that came with the system I bet they can get a copy...maybe even online.

Probably what the kid did.

Why not really mess with her and make an old fashioned alarm after she goes to bed, I'm thinking cans hanging from a string, or bells on the door type of loud low tech alarm that blares sound when it is seperated from the door.

My personal favorite is to tape a toothpick to the door and doorframe. If it is opened it gets broken.

insert Irish Sunglasses joke here

Without knowing who made the system, yes you generally can change the master code. Their problem is going to be if their daughter has half a brain in her head she has already done that so getting the master from the manufacturer, builder, or whoever will not do anything since it has probably already been changed by her.

Sounds like it's time for a new alarm if that's the case.

Or a lock on the daughters door. Win!

...or a chasity belt. :lol:

One would assume that a teenager like this has already had that lock picked.