<human>: So a little bit about myself, I'm a stay at home dad, who works from home due to my mental illness . My wife is a nurse and has a very workaholic attitude towards her profession. So I'm the one who usually deals with any issues at home but I have hit a wall when it comes to my 2nd oldest. She's recently became extremely withdrawn, unmotivated and locks herself in her room. This started at the end of April, and has gotten worse as the summer has went on, I've noticed she's been wearing long sleeve shirts, and jeans everyday, and she has hardly left the house or hung out with friends. I do poorly when it comes to figuring out what is wrong, I worry and get stressed easily and I tried asking what is wrong but she puts up a wall and tries to excuse herself from the conversation completely.

This put up a ton of flags to me, but I brushed it off, she's always been self-reliant, to the point where her older sister [18] will tell us what is wrong before she will come to us. I've tried talking with my wife about this and she basically thinks its a phase and not to worry. My 2nd oldest has recently dyed her hair to white, so I'm assuming my wife thinks this behavior is a phase. My question is how do I figure out what is going on, every time I try to ask she keeps it hidden, and I've asked if she was hot in all those layers due to the temperature in the area, and she just brushes it off, I'm worried she is hurting herself but don't know what to do. My wife thinks I am overthinking this and stressing too much and looking too hard for something that isn't there. Do you think I should be worried?

Can you provide a brief overview of the text?
<bot>: My 2nd oldest daughters behavior has changed over the past 2 months, don't know what to do or ask her what is wrong, suspect she is hurting herself.