I have been reading with interest.
I used to share a room with my 3 sisters. Needs must..4 single beds in a row. When one got married and moved out, we had one single bed and 2 bunk beds.
When that sister moved out, we had 2 single beds and continued sharing.
It's life.
I remember being 13 and thinking I was the bees knees and my parents were awful.
I did take umbrage when so called friends told me that another friend's home was much nicer than mine. That mine looked like a home. Yes there were 7 of us living in it! Compared to my friend's 2.4 point children perfect home.
Then I grew up and realised all that my parents had done for me all my life.
We couldn't afford holiday abroad. In fact I had one holiday with my parents in my entire life.
OP asked if her daughter was ungrateful and expects too much.
The short answer is yes. She is a teenager. This is how we all behaved. I never slagged off my parents or my parents home or the fact I had to share a room. We had no choice, it was the way we lived.
But there is nothing you can do about that. And don't start looking at room division and loft conversion and beds in sheds.
Sit your daughter down and talk to her. Explain how it all works. The cost of renting/mortgage, childcare, food, clothes etc
Ask if she wants to get a bit more involved. Maybe meal plan with you. Or be given a shopping budget and see how much shecan buy with it for meals for all three and friends etc.
She will grow out of it.
I am blessed. My 10 year old wants to know how long before he can start earning his own money.
Talk to your daughter. She cant help her behaviour. Social media, hormones, it all has an effect on her behaviour.