Should my aunt be worried about her foot swelling?

She's 68. She's been living with me for a couple of months. She was living in a tiny travel trailer for two years and she was sick pretty much the whole time. Her Sciatica was really bad too. So when we started moving her stuff from her old place and to mine, her left foot swelled. It went away, and a couple of days ago, it swelled again, and it goes halfway up her shin. She said that the same thing happened to her mother, and it turned out to be her heart. She passed away several years ago from heart disease. My aunt smokes and drinks a lot too. This has got us worried, so she's gonna see her doctor on Friday, but I'm thinking maybe I should take hee to the emergency room. What do you think?

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Maybe I should mention as well that when she was sick, she was puking up black stuff and it was difficult for her to breath. The doctors found nothing wrong with her though, and ever since she moved into my place, she's felt mostly normal besides some minor chest pain.
Should my aunt be worried about her foot swelling?
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