I just got my very first Milksnake and snake in general yesterday. Her name is Penelope and she's awesome! I'm very new to snakes, but from what I hear, I got really lucky. She doesn't musk, bite, and is VERY tolerant of being picked up and held.
I was intending on leaving her alone for a couple days and let her settle, but I came home today and just wanted to make sure she's alive, but she was all ready to come out I guess because she started reaching for my hand and arm so she could get out. I put her back down and closed the lid, but she just kept trying to crawl up the glass and come out so I let her. I had her out for about 10 min and tried to put her back in but she wasn't having it, so I just let her stay outside and explore me lol.
But is this normal? The fact that she is so eager to come out, especially since I've only had her for a day? Now I'm a little worried she's going to try to escape the tank

She's in a 20g tall with a screen top that fits kind of loosely. I weighted it down with some heavy textbooks for now but I probably need a better solution.
I'm scared to fall asleep now and go to work and school tomorrow because she's still trying to climb the glass!
Any advice and tips, even on general care, are very much appreciated! Thanks