She does tend to lie a lot for attention and has lied/exaggerated about cancer and other illnesses before.

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3 years ago, a year before my wedding, she told me that she has Hodgkin's lymphoma and they're in the watchful wait period (and for nurses/ anatomy nerds: she was going on about her white cell counts were 26,000). She gave me the name of a real oncologist, but he specializes in blood cancers, not lymph cancers. I understand they're similar, but I'm pretty sure we have lymph cancer specialists here, so idk why she's supposedly at this leukemia oncologist.

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Anyway, so that means she's been on "watchful wait" with no treatment for 3+ years! Which doesn't really sound right to me. She's vain and her hair is her biggest asset (or so she feels) and I think that's the only reason why she hasn't "gone through chemo" yet.

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Her cancer seems to get worse whenever I have news. To the point that when I started low dose chemotherapy for my lupus all she could talk about is how it's at least not as bad as what she'll have to go through, and "at least the doctors will actually treat you [me]."

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This is the woman who, when I was first diagnosed with lupus at 14, suddenly decided to start going out to places with me like church and tell everyone she could about her poor, sick child... but then threaten to whoop me if I didn't go to school even though my muscles seized up and arthritis flared and I vomited nonstop for an hour every morning because of the pain because I was "just faking it to get an easy day off and no school". (She was also abusive in other ways, but well not get into that right now)

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I don't know what to do or believe. I know I can't call her out on it because it would be so bad if she did actually have cancer and she needed my support to get through it, and 2 even if she doesn't have cancer she'd never admit it and my sister who's on her side would hate me.