Regina may have taken one giant step forward in an attempt to stop the darkness in her, but that doesn’t mean that all her problems will disappear. “Once Upon a Time” actress Lana Parrilla teased that her character may face more issues when Season 6 premieres on ABC.

For those that don’t remember, Season 5 of the fairytale drama ended on a heart-breaking note when Hades (Greg Germann) killed Robin (Sean Maguire). Regina (Lana Parrilla) was devastated by the death of her love, but continued to make progress with her sister, Zelena (Rebecca Mader). The two even managed to agree on naming Robin’s infant daughter after him. However, the recent union of Regina and Zelena might not carry into Season 6.

Fans can’t forget that Regina accidentally unleashed her inner Evil Queen. Unbeknownst to her and the other fairytale characters, this dark side of her is running amuck. This evil doppelganger can certainly wreak havoc on Storybrooke. But that doesn’t mean that “good” Regina is necessarily good. Parrilla revealed to Entertainment Weekly that her character might be struggling with the fact that her sister is the mother of — and raising — her dead boyfriend’s baby.

“Will Zelena and Regina continue to have a healthy relationship now that they’ve reconciled? Or will Regina end up hating Zelena for being the mother to Robin’s baby?” Parrilla says. “I’m curious to see what’s going to end up happening in that regard. Will she end up growing resentful that she can’t have children, but yet her sister has her boyfriend’s baby? I feel like that’s a story to be told. Are you going to stand side-by-side in a sisterhood or is Regina going to grow resentful over time?”

Regina and Zelena’s relationship is not the only question heading into Season 6 of “Once Upon a Time.” Co-creators Adam Horowitz and Edward Kitsis previously revealed to EW that the upcoming installment will revisit Lily (Agnes Bruckner) and Maleficent (Kristin Bauer van Straten). The storyline involving Maleficent’s daughter was introduced in Season 4, but left out of Season 5.

“Next season,” Horowitz promised. “Oh yeah, we’ll have plans. You’ll see, hopefully they’ll be great.”

Once Upon a Time Can Regina (Lana Parrilla) and Zelena (Rebecca Mader) maintain their new friendly relationship? Season 6 of “Once Upon a Time” will explore that struggle. Photo: ABC