Elsa can contact her family. She knows this. There's nothing but her own pride stopping her.
Her parents had attended her wedding, but they hadn't been happy. Now, she's doubting her own joy.
So, she can contact her family – knows she should. They'd help...
...But they'd expect her to come home, to Norway, and Elsa doesn't want – can't – uproot her life. Not now. She's made a life here, literally and figuratively.
Her dreams as a child were to find someone she loves and... make her own family.
None of them featured betrayal.