In an interview with Fancast, the actress explained that the show no longer has to introduce all the characters.
"Last season it was a story about how do all these random people come together to make a family," she said.
"Now that we've established that, we can meet other people and have other relationships and bring a lot of the lessons and the things they are going through back to the home front."
She continued: "The show just looks really big but at the same time we're still keeping the heart. It's a show about people still caring about each other and not being perfect and learning how to do the right thing."
Appleby also revealed that she is not concerned about the programme's future at the moment.
"We don't feel like we're questioning whether or not we want to be here for a while," she said. "We feel strongly that this is something that is going to continue to grow. It's like a little baby right now. Hopefully people will keep catching on because it's not a show that's glitzy or fashionable. It's a show about what's important in life, which is family and caring about each other. I feel really strongly that it's going to be around for a while."
Life Unexpected continues tonight at 9/8c on The CW.