S.E.
I, too, am a single mom. I know you don't want books. I know time is slim. However, there is too much information to give you on managing your toddler than can be given on this website! You don't have to read the entire book at once. Just one page at a time.
John Rosemond is the author I would recommend. His books are available at the library. I like him because he tells you what to expect from children. To that end, I think you may have inappropriate expectations for a three-year-old. Of course she's gonna grab the cup of hot chocolate. She was excited about it! The fault lies with the parent who made it so hot to begin with and didn't think to move it out of a toddler's reach!
It sounds like your toddler is completely normal. But, only the books can give you a complete picture of HOW to raise your child. It's not easy. There's no magic way to make another person do what you want. You are the adult. You are the parent. You need help and help is in the book "Parenting by the Book." It's a philosophy of child rearing that works BUT you have to apply it and apply it consistently.
A friend of mine calls me for parenting advice a lot. Finally, I cut her off and told her she couldn't call me again until she read the book and started taking the actions prescribed in the book. It works. It's hard. You're tired. But, you can get through this and NOW is the time because Gabriella is getting older and you have to find a solution now before you miss the window of opportunity to get her to behave.
Good luck!