It was written by a young, female (possibly Australian, I can’t really remember) author and probably came out somewhere between 2008-2013. It begins with the protagonist going about her day to day life (I think she was being bullied at school) until certain strange events cause her to discover she has magical powers (it might have been water magic?). She meets some sassy flying creature who goes on to become her companion. I think it ended on a cliffhanger but a sequel never came out. The story had lots of humorous moments and didn’t take itself too seriously.
The bright yellow cover also had the silhouette of a girl in a shirt and jeans on it. It looked something like this:
Unfortunately, that is all I can remember. Please help if you can!