(Original Publication Date, 8 May 1991)
Panel 1: We start things off with Fiona blowing off Mike's telling her that no one smokes in their house by saying that's why she's got the window open. A sane person would tag in an adult who could either usher her outside or tell her to get the fuck out if she can't follow house rules. Pattersons aren't sane. Pattersons are passive idiots.
Panel 2: This is why we see Fiona absently mutter "Well, you'll just have to watch him" as she helps herself to a sandwich and ignores the buzzing noises Liz is making about how her feral cat is clawing the curtains. Again, Liz does not talk to Elly about this so something could pretend to be done about the problem.
Panel 3: Now that we have Fiona smoking in Elly's house and her cat prowling her kitchen, we get to see Fiona be messy and lazy when horrified Elly asks who left a bunch of dishes in the sink only to have Fiona say that she cooked Beaumont up a little bacon and she'll clean'em up later.
Since she is only just starting to realize how fussy Elly is, she doesn't realize that this constitutes a problem. She might indeed do them later on but that isn't good enough for her host.
Panel 4: Since she's as self-aware as Mike is, Fiona is the picture of innocence when, having come across a flustered and traumatized Elly, says that it's a good thing she's there because Elly doesn't look too good.
Summary: We're starting to see what it is about her aunt that really bothered Lynn: the fact that she had no idea what she was doing to agitate her niece. Perhaps if she'd lived long enough to read the strip, she would have known.