Thank all of you so much for your concern and help! Everyone.
I will definitely get a rheostat ASAP. For now I've placed planks underneat the tank, and I'm keeping the thermometer directly on the glass to monitor the temp for the next 24hrs. I've got an acu-rite so it'll tell me Max/min temps. I'm not putting her anywhere near the tank right now.
As for the comment about insulating the tank. Is that something that is truly necessary? Or keeping her in a tub indefinitely? It seems a shame to have such a beautiful animal and not be able to see it.
Though I'm sure many of you are convinced at the moment that I'm undeserving of such a blessing...![]()