Dating a depressed girl is exhausting me

Long story short i’ve been dating this woman for two months now, everything was fine until mid November when she started acting cold and dry to me without any reason.

She then removed all her pictures from instagram, got less active on social media and would take hours to reply to me, until it became days of no reply. I did reach out to her many times after i’ve been left on read to understand what’s going and every time she told me that it has nothing to do with us, and it’s just lot of things going on.

A close friend of her told me that she talked to her recently and she hates herself because she is very sick these days, with lot of doctors appointments. I kept showing her support and one day i gave her space for like 3-4 days and she reached out to me saying she wanted to talk to me and see if im fine, i then asked for a call and i could clearly tell from her voice she was indeed very sick.

Yesterday i sent her flowers delivered to her house with a small message showing her support to cheer her up, she liked it a lot and kept thanking me, and then left me on read.

Idk what to do in this situation? Is it normal for someone depressed to just zone out like this? It’s making me overthink a lot and idk if it really has to do with her health or she just lost interest in me?