I need some guidance on bipolars regarding my girlfriend.

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I've known my girlfriend for quite some years and we have kinda been on and off for a while and she told me early on that she has been diagnosed with bipolars. I didn't exactly know what to think of it because at the time I don't think I fully understood what that meant, at all, and then we stopped talking for a few months and then again but we were dating different people and now a couple years later we are back together.

Thing is, I thought that when there were times she didn't reply in those couple years we weren't together were due to having a boyfriend or whatever but yesterday I noticed some real mood changes, and I'm not sure if it's due to bipolars or if it's something else but she has gone MIA again.

Won't reply, deactivated Insta, tiktok, whatever. And two days ago she was very well very happy because we were back together and that she missed me. But it wasn't THAT sudden, first she started replying a little dry, then taking long to reply, not engaging in conversations until eventually she stopped answering.

What I wanted to know is how do I face the situation? I'm not mad, I am kinda sad that she is not doing so good but I wanna do something, and at least I wanna know if it is anything to do with bipolars or if it's something else going on.

I wanted to ask her if it was her bipolars but I thought it might sound rude or insensitive or something so I didn't but I also don't wanna just sit tight until she's better...