set up advice

Ok so having been on this forum for about two weeks I ha ebdiscovered snakes are so much more detailed to care for than I originally thought. Here's what I inherited from the previous owner:

10g tank aquarium w screen lid,
fancy bp.
two toilet paper rolls for hides

I have bought;
a tree branch thingy for her to hide in,
Water bowl
Humidity gage (digital)

Unfortunately I do tbhave pics here but I will post some on Facebook later for anyone who feels the need to see what's going on

Toke is approx 4mo old. Was told she is a female.
Don't know her weight, the temps, or anything except the humidity gage usually reads 45-50. I try to spray the tank down and keep it covered somewhat w a towel. A large piece of concrete brick holds the lid in place...for now.

What can I do to make Toke happier without going broke?

oh yeah. She had an under tank heater when I got her

The only store in my area that carries reptile supplies is petsmart so unfortunately....yeah...and that where she was bought from too although I get her meals from a different petstore in town that's better to their animals but doesn't really carry supplies as far as gages thermometers etc