What Causes Bloating Of The Stomach?

i was just speaking with a friend who is into menopause now and on estrogen, and she was saying that she hasn't felt well for day and now this afternoon she's noticing she is getting very bloated, even in her hands for example she said she can barely make a fist or hold onto things because her skin everywhere is so bloated, and this is rather sudden. i saw her in person just yesterday and she was getting stomach pains and got some medication for it (i don't know what). she is a cancer survivor and currently also has a sprained knee. she said her kidneys seem to be operating ok, meaning, i believe, she's doing plenty of urination productively.
the sudden bloating rings some kind of bell in my (ignorant) head and makes me feel a bit alarmed to hear about.
she doesn't have internet and if i call her back i'm not sure she'll still be up or answer the phone, trying to sleep, but, do you have any thoughts(?) which -to you- feel urgent that you'd want to tell me in case i Can reach her again tonight, --anything like a red flag i should ask her or mention she consider?
thank you,
sincerely, peter hunt, new jersey