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There are thermostats you can lock so she can't adjust the temp. Is that acceptable?
I can do some research but the only thermostats of that type would likely be analog so no overnight setback capability. Let me know if that's OK.
There are few programmables that you can program a max/min temp as well. Let me know if you have a preference. Also need to know what has for equipment, heat only? heat & AC? a heat pump?
Here's a digital with (programmed) Hi Lo set point limits. Reliable brand.
http://www.supplyhouse.com/Robertshaw-RS4110-Digital-Non-Programmable-Thermostat-Heat-Pump-Single-Stage-1-Heat-1-Cool (can be used without a heat pump)
I can't spec one that you might get at a local big box store because I have no idea what they might have in stock.