She looks better than when you got her which is good news, but still as you know, still way too thin. I'm actually surprised the vet did not tube her. Eating needs to be a priority on a 4 to 5 day schedule until she gets up to weight however you can get it done. She is going to be a pretty girl when she gets older.
If those dials are on the inside of the tank and they are stuck on with anything sticky, please get rid of them or you may end up back at the vet. Any kind of tape and snakes do not mix. The worst injuries I have seen with snakes have either been caused by heat or tape.
A thermostat is a must if any heat is being supplied to the enclosure. This is not an optional thing. Look up snake burns and you will see why I say this. Ball pythons are stupid when it comes to heat. They would rather burn than be cold.