My tarantula is HUNGRY. eats everyday, good or bad? newbie here.?

[Carlo De guzman]

I have a new tarantula, grammostolla pulchra spiderling around 1.5inches.
It's eating a lot. 1 superworm per day for the past 4 days.
I heard they don't overfeed , and since i am a kid I can't resist putting a super worm everyday leaving it for a few minutes, and if she doesn't eat it I take it out.
Anyways is this a good or bad thing?
How do you know if she is stressed?
My enclosure is a fish bowl, yeah, around 5 inches in diameter. I have plastic covered on top with a few holes. About 1 inch of substrate. and a little cut box, where she stays, in the middle of the bowl. Any comments suggestions for a newbie?
Every night time, when i touch the bowl it is quite cold and i really have no idea what to buy (heating mats or whatever) or is this a normal thing?
I really am fascinated with these creatures I'm gonna ask my parents to buy me more other newbie species
Tips for people like me? THANKS

I want her to moult but she's eating alot so that must mean it's gonna be a while since she molts :|