The hide is too big for her, but on the other hand if she's eating a f/t rat every week then I wouldn't change it. She's clearly comfortable in it. Same goes for the water dish. However, to answer your question, yes there are smaller hides. The one you have looks like an exo terra hide, and they come in smaller sizes.
As for the UTH. You can get a medium or large, but don't plug it in until you have a thermostat to regulate it.
I'm not sure where in Canada you are, but the CRBE is just around the corner and you can find thermostats there for pretty cheap.