She'll probably need a lightweight waterproof turnout sheet (no fill) and medium weight (200g fill) waterproof blanket to start. If she's thin skinned like a lot of TBs and it gets really cold, she might need a heavyweight too. I think I sold all my 78s last year, but I'll check and see if I have any extras! Ebay
is a great place to check too, especially this time of year when most people aren't thinking of buying blankets yet.