Thanks to this
entry, I've looked around on that community again and their daily_loli spinoff, and if she's definitely pushing 25 in the physical department, she ought to go classic if she wants to stay but if there's still a babyface, maybe she'd get away with what they call the
radioactive cupcake shit. It will also help if she's in on the joke of loli looking like an old fashioned infantile giant. If she takes it too seriously and doesn't react well to being told she looks too old to work the younger, sweeter styles, she should reevaluate why she's there.
I've also found stuff there that looks like something a 50s housewife would don (like flower/shopping/recipe/alphabet/food patterns), maybe she'd dig that.
(Take out the periods if you want to see the links)