The poem doesn't really address love head-on, but it certainly gives us a glimpse into courtship (a.k.a. dating) and romantic love. If you exchange "Tom" or "Joe" for "Death" here, this could be a pretty good example of dating for the 1800s. The speaker's tone in the poem makes the reader believe the speaker does not fear death, but feels the opposite toward it. If the poem did not explore death with an underlying theme of love, the acceptance of death might eventually be hard for the reader to believe.
The speaker knew about the date beforehand and that's why she's dressed up and not at all surprised to see Death.
The speaker hasn't really passed into an afterlife, but lives in the "house" with Death.