A lot of what to do depends on where she lives. In some areas, if you turn off the main water supply, you also turn off the water for irrigation. Most homes have a shut-off valve in the garage or for some CYVs, in the front yard away from the main valves.
I doubt it would damage the water heater since it is pretty common for snowbirds to shut off the valve. Of course, most snowbirds have a home watch person to turn on the water weekly to ensure there are no leaks, etc.
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Army/embassy brat - traveled too much to mention
Moved here from SF Bay Area (East Bay)
"There are only two ways to live your life: One is as though nothing is a miracle; the other is as though everything is a miracle." Albert Einstein
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