Episodes airing on Channel 5 this week see the actress's character Marilyn Chambers growing closer to the villainous Danny Braxton (Andy McPhee), who was recently released from jail.
Symons is currently in London for a Home and Away promotional trip and discussed the ongoing story on This Morning today (September 4).
Pictured: Emily Symons on This Morning.
Speaking to show hosts Philip Schofield and Holly Willoughby, the 43-year-old confessed that she didn't want Marilyn to appear foolish for trusting Danny when filming the episodes.
Symons explained: "I didn't - because actually, she's not dumb. She doesn't mind if people think she's a bit ditzy, because she's actually quite smart - she's switched on but she doesn't care. I think it's very important to have someone who is so confident in her own skin and she doesn't care what anyone else says about her.
"The Danny Braxton thing, I just felt it was very important that she does believe that everyone should have a second chance in life. She just takes him on face value. A lot of these criminals are very charming and that's how they get away with a lot of their crimes."
She continued: "I think it's quite good, because Marilyn doesn't really have anything to do with the Braxtons. I've never done any scenes with the darker side of the Bay, so it's bringing a little bit of comedy into that criminal element. She's a little bit scared of them."
The former Emmerdale star, who returned to Home and Away in early 2010, added that she hopes to stick with Summer Bay for the foreseeable future and has no plans to move back to the UK.
She said: "I'm an auntie now. My brother and his partner had a beautiful baby called Eva. I just love being an auntie, and it does give you a good focus being back in Sydney."
Home and Away airs weekdays at 1.15pm and 6pm on Channel 5.