How do I help my girlfriend

My girlfriend(F25) goes through these episodes sometimes once a week. Sometimes once a month. (There are triggers and lately its been her work). Where she gets severely deppressed and suicidal. I've always done my best to talk with her. Comfort her. But I feel like im not handling it correctly. Im trying to go easy on her, not stress her out or try to worry her. I try not to talk about subjects I know will send her down a spiral. She's been really depressed for about a week. Skipping work. Not doing homework. And look I understand. I know what its like, I grew up with a sister with depression. But I dont know what to do. I talked to her about work, I know she hates it but its how she's paying for her car and phone bill, and theyre paying for her schooling, so from an outsider perspective I worry that they'll fire her and she'll lose these benefit, luckly they really like her and have given her as much time as she needs. And if she did lose her job id do everything in my power to support her, id try to take over her bills and pay for the rest of her school. But I dont know how to approach her about these things gently. But above all else. More important than that. I just want to know how best to support her ememotionally, I hate seeing her feel this way and i want to do whatever i can to be there for her.