What should I do...?

My best friend and I both deal with depression. But she has bipolar depression, and she's very confusing and hard to keep up with. We've vowed to always stick by each other, and never keep secrets, or lie. Which I've kept. But she never listens to me anymore or wants to talk or facetime. We live six hours away from each other...and I miss her so much. But since I left she's gotten so much worse and she hates her living with her mom and I don't know what to do. I mean there's only so much of her ranting I can take. But when I rant about something she just doesn't reply or says hm. As if it were nothing. My stuff is usually more important too...like about how my mom fat shames me, and she talks about her A- that she's been crying about for five hours. I'm so confused. I don't want to stop talking to her. She's my best friend, and I love her so much, and I'd never want to lose her. I don't know where'd I be if I hadn't met her two years ago. Sometimes she's even suicidal, and it breaks my heart. It used to be different...and I wish that we could both talk and listen and it wasn't just a one sided thing. We do see each other in person but it's with her mom there in a hotel. and we've agreed we need a day to ourselves where we can literally just hug each other and cry and that's it. But I'm not sure when we'll even get a chance like that... What's your advice...?