Is this a sign of depression?

My best friend is staying in her room since she got divorced and never leaves it. She left her work too to stay with her kids. She works part time job now and rented very small apartment to stay away from her family but I don’t like this. She started to hate men now, love, sex and everything related to it. She has 2 kids 3 and 2 years old and I’m worried about them too. I’ve told her that she needs help but she said she doesn’t. I worry about the kids too for never leaving the house since 7 months. They’re staying like prisoners in their house & now she just turned her phone off.

Is this a sign of depression?
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