- "It's just, I miss Mark. He said he'd spend New Years with me, but stuff changes. Now he's with dumb Daniella Spencer."
- ―Kate McReary to Salvador, after thinking Mark Sanders cheated on her with Daniella
- "Daniella Spencer...is my step cousin. During that week of San Salvador's party, my step dad's family came to town from Arizona. So I thought I'd, you know, show Daniella around. I'm really sorry, I never cheated on you, I was just with my family."
- ―Mark Sanders explaining Daniella to Kate
Daniella Spencer is a mentioned character in Sibling Rivalries. She is the step-cousin of Mark Sanders.
Description[]
Around the time the comic "San Salvador's Story" took place, Mark's step-father's family came to Green Bay, Wisconsin from Arizona. According to Mark, he decided to be a "good cousin" to Daniella, so he showed her around town. When "San" Salvador Martinez had one of his awesome parties, Mark decided to take Daniella with him there. However, Mark had already agreed to go to Kate. Although it was never seen in the series, Kate had seen Mark hanging out with Daniella at the party, and she got suspicious. Thinking that Mark had cheated on her, she then breaks up with him.
At Packie and Francis McReary's New Year's party, Kate McReary is still upset about Mark after they had broken up two months ago. Salvador Rosales, a friend of Packie's, comforted Kate at the party, and Kate fell in love with Salvador. However, Salvador wasn't very excited about the idea of dating someone seven years younger than him.
Kate and Salvador continued to date throughout 2014, until July 2015, when they hang out at the town's local pool. Mark, who sees the two together, becomes upset and tells Tony Gonzales (who remembers him from San Salvador's party) that it was all a big misunderstanding, and Daniella is his relative, not his new girlfriend. Tony encourages Mark to try to tell the truth to Kate. Mark thanks him, and walks up to Kate. She isn't happy to see her ex-boyfriend, and tells him to go away, because she is hanging out with her new boyfriend, Salvador.
Mark then explains to Kate about everything with Daniella. However, Kate still refuses to believe him. Mark then holds her hand and asks her if he would ever lie to her. Surprised to see her hand being held by Mark, Kate then looks at Mark, who begins to cry. She glances to Salvador, who is watching everything a few feet away. Looking back at Mark, she replies to his question with "No Mark. No, you would never."
Kate hugs Mark and tells him that she missed him, and Mark said he missed her too. Salvador is confused, and Kate thanks him for keeping her company after Mark broke her heart, but she is ready to go back with Mark. Salvador walks away by himself as Kate and Mark walk into the sunset holding hands.
It is unknown what happened to Daniella, although it is likely that she returned back home to Arizona with her family. She has not been directly mentioned again since Season 3, although there is an indirect mention of her in Season 12's "Black Bear; after Kate was assaulted by a high school senior named Bruce Warren (who claimed to be a cousin of Mark to get closer to Kate), Mark recalls that he is familiar with all of his cousins (likely including Daniella), and knows Bruce isn't one of them.