I wanted to know how can I have this soundtrack, or how can I do to rip them…
She said that she was considering releasing an official ost. So, I can’t really help you, but if she does decide to release it, you can bet there will be plenty of people ready to share it.
Also, if you really want to hear the music, youtube all of them. CaptainFawful has uploaded all the songs. Just search "plants vs. zombies music".