Sorry, but I'm going to have to leave the hard work for someone else on this one.

If anyone wants to improve my translation of Shirley's monologue, here's the original text.

「とりあえず次は喫茶店どお茶　そのあと映画に行って　ディナーは夜景の見えるホテルで　最後は酔った振りをして部屋で休むことにして　そのまま勢いで　あっは～ん　ってあたし気ー早すぎ？　ううん　ルルもきっとそのつもりだよ　だっていつもそっけないルルが自分から付き合おうって言ってくれたんだよ　きっとそうだよ！　そう思ってちゃんと勝負下着も着てきたし　うちにも遅くなるかもって伝えたし！　あぁ　あたしってはついに大人の階段を上っちゃうのね」

Who she means by "her folks"? Didn't her father die?

She literally says "her house", by which people usually mean their family. I have no idea who she's talking about either. Presumably she has a mother?

okay, that's it then, thanks.

Yes, I do believe her mother is still alive.
I must confess I haven't been keeping up-to-date with Code Geass.