Yes, a thermostat is a different thing from a thermometer. A thermometer only measures temperatures, a thermostat regulates power to a device (like a UTH) based on temperatures. A thermostat will have its own built in temperature probe (similar to the one your thermometer has). That probe measures the temperature of your UTH and tells the thermostat whether to turn it up/down (or on/off). It can be a confusing concept, but they're two different and useful things!
Also, I just noticed you say you're feeding her pinky mice. That seems a little small to me. Most breeders say even their freshly hatched pythons are eating larger prey that that. The general rule is to feed your snake something that is as or slightly wider than the widest point of your snake. I'd bet your snake is definitely wider than a pinky mouse!
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