FWIW, maybe if she shopped around, she could find a reasonably priced monitoring service, that would be worth the investment. It may not be right for everyone, but there are some advantages to having a monitored service.
* Many offer fire monitoring as well as burglary, so whether someone asleep being overtaken by smoke before they can do anything about it, or a thousand miles away, at least someone would be notified of a fire
* Some have 'real-time' monitoring, which bring an operator from the monitoring center on line through your speaker to get real-time info from you to share w/ emergency responders, especially if you can't get to a phone, or if you're away, they can tell someone's actually in the house, w/out relying on someone to answer the phone, and tell first responders what's going on.
Plus all the regular reasons. Sorry to hijack, but just thought sometimes people don't want to spend the $$ every month to monitor burgarly, but might be able to justify it if it monitored fire too, or don't know about the newer 'real-time' services, etc.
As for your actual request, I've searched for stuff like that before, for a relative in an apartment, you can find all sorts of inexpensive door and window alarms online, and even motion detector alarms, that are point-of-sale, no monitoring offered, no monitoring paid for. But, for a complete system, you could get one for free from many providers by signing up for the monitoring $20-$35 mo. maybe), while trying to sign up for the shortest term possible (1-3 yrs, depending on how much stuff they threw-in) and then once the contract is up, renegotiate a lower term (since the equipment is paid for by then), or if you pay for a system up front, you could get the lower monitoring ($15-$25 month).
But if you want the non-monitored, google stuff like window alarm, door alarm, home secuirty, etc., dig a little and you'll find some stuff.
Good luck whatever you do!
Karz