So your house is seriously overcrowded with old, damaged furniture that social services have noted.
You have yet another baby on the way.
The daughter concerned is living with a mother who doesn't love her and will freely say so, and has been ditched by a father and a stepfather who "hates her". She has been blamed for the loss of her mother's romantic partner.
Your daughter is spending time with friends who self-harm and may have mental health issues. Your response to this is to ridicule them and jealously remark that the one who is "worst" has "parents who are together".
Your attitude is callous towards your daughter. You act like she's a friend you've fallen out with, talking about cinema and lunches, trying to get sympathy by quoting things she has said in anger on here, saying you spoil her (when we have no way of knowing whether this is true and, FWIW, giving a 16-year-old the privacy of her own room is NOT spoiling her, it is an incredibly basic need). This is not a competition of you vs. her, you're supposed to be her parent, you're supposed to be a bloody adult. You sound sixteen yourself.
Imagine what she's going through, spending all day with friends who are in pain, probably supporting them. Then she comes home, retreats into Game of Thrones that her mum calls "weird shit", her mum "almost kills her" when she lashes out at a younger sibling (in an overcrowded house with a toxic atmosphere, where everyone is likely permanently on top of each other with no room to breathe, and a mother who rages).
Look at what you've done. This is all YOUR own making. Take a good hard look at yourself.