My sister is in her early 30s with a wonderful husband and two kids (4 and 1). Her husband and my DH are best friends yet they live quite far from us. For the past 2 years her husband has been communicating with us that he is really worried about her. She is very non-communicative, she doesn't interact well with the kids, she won't leave the house and he feels she is lying to him about what she does during the day - she is a SAHM.
When then"Twilight" books first came out, my sis thought they were awesome. She would post excerpts, biographies about the characters, and when the movies came out, clips and pictures all on her FB page. I kind of shrugged them off. Thought it was weird and a little obsessive, but nothing to be concerned about, sort of like a teen crush. Sis eventually changed her FB, and deleted all her friends other than friends she had on a "Twilight" chat group. She said that she did it because she only used FB to communicate with her "Twilight" friends.
I went out to visit her last month and was shocked. She spends all day, every day, communicating with other women on this chat group. They discuss, ad nausium, specific details about the movies and books. She completely ignores her kids while she is chatting and when her DH calls or comes home, she lies about what she has been doing. She doesn't see it as a problem but rather a normal release of stress. But she fantasizes about the characters to the point that sometimes I am not sure if she realizes they are not real.
Sorry so long, but I think she needs help but don't know how to convince her or her husband that something is seriously wrong.