Matt has said in one of her interviews that she is not a fussy girl, usually she'll take whatever the elders give her that is why in the past she played the kiddy role a lot. She doesn't seemed to put acting above everything else in her life. She takes what she could with school and other things in her life, resulting to only one lakorn per year and nothing more. I don't think she is in the industry with a goal of becoming a super famous actress, she does it because it's something she likes doing but it's not something that is the most important. And it is true, she hardly goes to events. I don't know who said this (don't remember at the moment) but she doesn't accept events often. So, it comes down to the fact that Matt herself said acting is a hobby. So basically, she'll act in her terms. It's unfortunate, for her fans because she is such a talented girl.
I'm not sure which one she was offered first. If she had auditioned for Likit Sanae Ha and got the role then if Wave Media came in second wanting her it's true to her nature to reject the lakorn. Since she has already accepted her one lakorn per year. She might already have something in the work that we don't know about at the moment. To me, even if she knows the lakorn is produce by a good company or the lakorn is good in itself, it doesn't quite matter to her. She seemed to take what she wants and that is about it.