Supporting my girlfriend through situation with her flatmate, without giving her advice?

She's an adult and more than capable of looking after herself and making her own decisions.

I don't want to give her advice, because it's not my place.

She reached out to me today to say that she's had enough of her flatmate.

It's been on the ropes for quite a few weeks now, and I think she's fed up with how her flatmate treats her - her flatmate seems a bit bipolar and controlling.

Apparently today, her flatmate complained that my girlfriend uses the laundry machine too often. She then went out to buy my girlfriend new sheets for her bed... And then put them on for my girlfriend.

My girlfriend works until midnight all week, so she must be a bit overwhelmed.

She's said that's she's done and is going to be looking for another flat. It sounds like she's made up her mind, too.

What can I do?

Supporting my girlfriend through situation with her flatmate, without giving her advice?
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