Bad wording aside, why is she acting like as a parent she can't dress up? I know tons of parents who dress up to go trick or treating with their kids, or even parents who go on halloween nights out. Just because you've had a child Lily doesn't mean your life is over? She does this all the time and it drives me mad. If you really wanted to do something you could, you have family who can watch your kids or hire a baby sitter like the rest of us commoners... you're acting like your kids have ruined your life, but they haven't, you've chosen this life of not doing the things you once did.
I get that this one halloween she's heavily pregnant, but she was the one who was so smug about having a baby born after september so she's brought this on herself! But also i've seen so many cute pregnant people costumes which aren't hard to pull off that she could do.